Backport dotnet/runtime#71436 (mono#21519)

Backport dotnet/runtime#71436
Backport of mono#21516 to 2020-02

Co-authored-by: Thays Grazia <[email protected]>

Bump nuget.exe to v6.2.1

Set app context to null on thread detach (mono#21489)

When a domain is unloaded, it is possible that an InternalThread
has a reference to an app context from the unloaded domain.

Co-authored-by: Bill Holmes <[email protected]>

[2020-02] Bump corefx to get MaxResponseHeadersLength fix (mono#21475)

Co-authored-by: Steve Pfister <[email protected]>

[mono] Remove some of the restrictions on constrained calls from gsha…

…revt methods. (mono#21471)

This is a backport of dotnet/runtime#59182.

Co-authored-by: Zoltan Varga <[email protected]>

[2020-02] Use upstream zlib 1.2.12 (mono#21460)

* Use upstream zlib 1.2.12

* [zlib] Cherrypick upstream crc32 fix

Cherrypick crc32 fix to restore pre-1.2.12 behavior

madler/zlib@ec3df00

> The previous releases of zlib were not sensitive to incorrect CRC
> inputs with bits set above the low 32. This commit restores that
> behavior, so that applications with such bugs will continue to
> operate as before.

Co-authored-by: Aleksey Kliger <[email protected]>

Bump corefx submodule to get brotli update

(cherry picked from commit 71ad7a0)

[2020-02][Android] Workaround for invalid return value from clock_nan…

…osleep (mono#21435)

* [Android] Workaround for invalid return value from clock_nanosleep (mono#21433)

Fixes dotnet/android#6600

Backported from dotnet/runtime#64679 and dotnet/runtime#65373

(cherry picked from commit 36daf03)

* Fix Windows build

Co-authored-by: Simon Rozsival <[email protected]>

Disable ClientWebSocketTest tests that started failing for no reason

(cherry picked from commit 1faa768)

[Tools] Fix mono-api-html MarkdownFormatter.cs to avoid a NRE (mono#2…

…1431)

One of the changes in macios revealed a bug in which @new can be null
resulting in a NRE like the one that follows:

System.NullReferenceException: Object reference not set to an instance of an object
2022-01-26T09:23:11.9538790Z   at Mono.ApiTools.MarkdownFormatter.DiffModification (System.Text.StringBuilder output, System.String old, System.String new, System.Boolean breaking) [0x00013] in /Users/builder/jenkins/workspace/archive-mono/2020-02/ios/release/mcs/tools/mono-api-html/MarkdownFormatter.cs:181
2022-01-26T09:23:11.9543530Z   at Mono.ApiTools.ApiChange.AppendModified (System.String old, System.String new, System.Boolean breaking) [0x00000] in /Users/builder/jenkins/workspace/archive-mono/2020-02/ios/release/mcs/tools/mono-api-html/ApiChange.cs:49
2022-01-26T09:23:11.9547700Z   at Mono.ApiTools.FieldComparer.Equals (System.Xml.Linq.XElement source, System.Xml.Linq.XElement target, Mono.ApiTools.ApiChanges changes) [0x0008c] in /Users/builder/jenkins/workspace/archive-mono/2020-02/ios/release/mcs/tools/mono-api-html/FieldComparer.cs:123
2022-01-26T09:23:11.9551430Z   at Mono.ApiTools.MemberComparer.Compare (System.Collections.Generic.IEnumerable`1[T] source, System.Collections.Generic.IEnumerable`1[T] target) [0x00053] in /Users/builder/jenkins/workspace/archive-mono/2020-02/ios/release/mcs/tools/mono-api-html/MemberComparer.cs:111
2022-01-26T09:23:11.9554840Z   at Mono.ApiTools.MemberComparer.Compare (System.Xml.Linq.XElement source, System.Xml.Linq.XElement target) [0x00064] in /Users/builder/jenkins/workspace/archive-mono/2020-02/ios/release/mcs/tools/mono-api-html/MemberComparer.cs:66
2022-01-26T09:23:11.9558230Z   at Mono.ApiTools.ClassComparer.Modified (System.Xml.Linq.XElement source, System.Xml.Linq.XElement target, Mono.ApiTools.ApiChanges diff) [0x00172] in /Users/builder/jenkins/workspace/archive-mono/2020-02/ios/release/mcs/tools/mono-api-html/ClassComparer.cs:238
2022-01-26T09:23:11.9562840Z   at Mono.ApiTools.Comparer.Compare (System.Collections.Generic.IEnumerable`1[T] source, System.Collections.Generic.IEnumerable`1[T] target) [0x00084] in /Users/builder/jenkins/workspace/archive-mono/2020-02/ios/release/mcs/tools/mono-api-html/Comparer.cs:94
2022-01-26T09:23:11.9566810Z   at Mono.ApiTools.ClassComparer.Compare (System.Xml.Linq.XElement source, System.Xml.Linq.XElement target) [0x0002c] in /Users/builder/jenkins/workspace/archive-mono/2020-02/ios/release/mcs/tools/mono-api-html/ClassComparer.cs:68
2022-01-26T09:23:11.9570610Z   at Mono.ApiTools.NamespaceComparer.Modified (System.Xml.Linq.XElement source, System.Xml.Linq.XElement target, Mono.ApiTools.ApiChanges differences) [0x00017] in /Users/builder/jenkins/workspace/archive-mono/2020-02/ios/release/mcs/tools/mono-api-html/NamespaceComparer.cs:79
2022-01-26T09:23:11.9574480Z   at Mono.ApiTools.Comparer.Compare (System.Collections.Generic.IEnumerable`1[T] source, System.Collections.Generic.IEnumerable`1[T] target) [0x00084] in /Users/builder/jenkins/workspace/archive-mono/2020-02/ios/release/mcs/tools/mono-api-html/Comparer.cs:94
2022-01-26T09:23:11.9578000Z   at Mono.ApiTools.NamespaceComparer.Compare (System.Xml.Linq.XElement source, System.Xml.Linq.XElement target) [0x0002c] in /Users/builder/jenkins/workspace/archive-mono/2020-02/ios/release/mcs/tools/mono-api-html/NamespaceComparer.cs:51
2022-01-26T09:23:11.9581650Z   at Mono.ApiTools.AssemblyComparer.Modified (System.Xml.Linq.XElement source, System.Xml.Linq.XElement target, Mono.ApiTools.ApiChanges diff) [0x00055] in /Users/builder/jenkins/workspace/archive-mono/2020-02/ios/release/mcs/tools/mono-api-html/AssemblyComparer.cs:89
2022-01-26T09:23:11.9586220Z   at Mono.ApiTools.Comparer.Compare (System.Collections.Generic.IEnumerable`1[T] source, System.Collections.Generic.IEnumerable`1[T] target) [0x00084] in /Users/builder/jenkins/workspace/archive-mono/2020-02/ios/release/mcs/tools/mono-api-html/Comparer.cs:94
2022-01-26T09:23:11.9589520Z   at Mono.ApiTools.AssemblyComparer.Compare () [0x00000] in /Users/builder/jenkins/workspace/archive-mono/2020-02/ios/release/mcs/tools/mono-api-html/AssemblyComparer.cs:63
2022-01-26T09:23:11.9592880Z   at Mono.ApiTools.ApiDiffFormatted.Generate (Mono.ApiTools.AssemblyComparer ac, System.IO.TextWriter outStream, Mono.ApiTools.State state) [0x00013] in /Users/builder/jenkins/workspace/archive-mono/2020-02/ios/release/mcs/tools/mono-api-html/ApiDiff.cs:222
2022-01-26T09:23:11.9596490Z   at Mono.ApiTools.ApiDiffFormatted.Generate (System.String firstInfo, System.String secondInfo, System.IO.TextWriter outStream, Mono.ApiTools.State state) [0x00008] in /Users/builder/jenkins/workspace/archive-mono/2020-02/ios/release/mcs/tools/mono-api-html/ApiDiff.cs:208
2022-01-26T09:23:11.9600250Z   at Mono.ApiTools.ApiDiffFormatted.Generate (System.String firstInfo, System.String secondInfo, System.IO.TextWriter outStream, Mono.ApiTools.ApiDiffFormattedConfig config) [0x00007] in /Users/builder/jenkins/workspace/archive-mono/2020-02/ios/release/mcs/tools/mono-api-html/ApiDiff.cs:202
2022-01-26T09:23:11.9603590Z   at Mono.ApiTools.Program.Main (System.String[] args) [0x002f9] in /Users/builder/jenkins/workspace/archive-mono/2020-02/ios/release/mcs/tools/mono-api-html/ApiDiff.cs:159

The change that exposed the bug is: dotnet/macios@d78aa67

The above exception is avoided by ensuring that nor old or @new are
null.

Co-authored-by: Manuel de la Pena <[email protected]>