array: mark the array to grow as volatile

This works around strict aliasing rules letting some versions of
GCC (particularly on RHEL 6) thinking that they can skip updating the
size of the array when calculating the next element's offset.

libgit2 v0.21.0

Merge pull request libgit2#2425 from libgit2/cmn/clone-auth-change

Don't use read-write accounts for the tests

Merge pull request libgit2#2407 from libgit2/cmn/remote-rename-more

More remote rename fixes

libgit2 0.20.0 "anmeldung"

Apologies for the delay. This release is chunky,
but you're probably used to chunky releases by now.

Full changelog follows:

Internal changes
	+ Added support for decomposed Unicode paths in Mac OS X
	+ Added support for junctions in win32
	+ Fixed issues with HTTP redirects in the network stack
	+ Performance improvements (as always)

git2/blame.h
	+ added full support for blame operations

git2/blob.h
	+ added `git_blob_filtered_content` to load blobs in
	memory with their corresponding filters applied

git2/branch.h
	+ added branch iterators as an alternative to the
	callback-based API

git2/buffer.h
	+ exported the git_buf struct to allow binary buffers
	to be passed from/to the library. This simplifies
	several APIs

git2/checkout.h
	+ implemented additional checkout options ('skip unmerged',
	'use ours' and 'use theirs')

git2/clone.h
	+ simplified the clone API
	+ added new `git_clone_into` to clone into an existing
	(empty) repository

git2/commit.h
	+ added APIs to access the raw (uncleaned) text of a commit
	message

git2/common.h
	+ added global options to set the default paths to load
	templates from

git2/config.h
	+ added multivar iterators
	+ added globbing iterator
	+ added `git_config_foreach_match` to perform operations
	on every single var in a config file

git2/diff.h
	+ restructured and simplified the diff API

git2/filter.h
	+ added external APIs to configure and apply custom filters
	to checked out blobs

git2/index.h
	+ `git_index_read` can now force a reload of the index file
	even if it hasn't changed on-disk

git2/indexer.h
	+ improved the streaming indexer APIs

git2/merge.h
	+ added support for merge!

git2/object.h
	+ added helper API to lookup a generic object by path

git2/pack.h
	+ added progress callbacks to the packbuilder

git2/patch.h
	+ added support for patch generation as part of the Diff
	API revamp

git2/pathspec.h
	+ added helper APIs to work with pathspecs and match files
	in the workdir or diffs

git2/push.h
	+ added progress callbacks to push

git2/reflog.h
	+ changed reflog APIs to work on reference names instead of
	the references themselves, so they become less racy

git2/remote.h
	+ added support for setting refspecs on remotes, either at
	creation or on existing ones
	+ simplified the remotes API

git2/revwalk.h
	+ add API to simplify parents during a walk

git2/signature.h
	+ add helper to create a signature with the default values for
	a repository (i.e. the set `user.name` and `user.email` values,
	and the current time)

git2/submodules.h
	+ improve the status detection for submodules

git2/sys/
	+ exported many new internal APIs, such as pluggabe transport
	APIs

-vmg, out

libgit2 v0.19.0 "gut merge"

Minor point release! We got a lot of rather large features that we
wanted to get settled in:

- New (threadsafe) cache for objects
- Iterator for Status
- New Merge APIs
- SSH support on *NIX
- Function context on diff
- Namespaces support
- Index add/update/remove with wildcard support
- Iterator for References
- Fetch and push refspecs for Remotes
- Rename support in Status
- New 'sys/` namespace for external headers with low-level APIs

As always, this comes with hundreds of bug fixes and performance
improvements. We're faster and better than ever. And we haven't broken
many APIs this time!

Build stuff.

Merge branch 'development'

Merge branch 'development'

Conflicts:
	.travis.yml

libgit2 v0.16.0

libgit2 v0.15.0 "Das Wunderbar Release"

I am aware the codename is not gramatically correct in any language.

Check the COPYING file for the detailed terms on libgit2's license. Check
the AUTHORS file for the full list of guilty parties.

As we slowly stabilize the API, we've dropped 1 function from the library,
and changed the signature of only 5 of them. There's of course a good
chunk of new functionality, and a thousand bug fixes.

In this release of libgit2:

	- Changed `git_blob_rawsize`: Now returns `size_t` instead of int, allowing
	files >4GB in 64 bit systems.

	- Removed `git_commit_message_short`: Please use `git_commit_message`
	to get the full message and decide which is the "short view" according
	to your needs (first line, first 80 chars...)

	- Added `git_commit_message_encoding`: Returns the encoding field of a commit
	message, if it exists.

	- Changed `git_commit_create`, `git_commit_create_v`: New argument `encoding`, which
	adds a encoding field to the generated commit object.

	- Added `git_config_find_system`: Returns the path to the system's global config
	file (according to the Core Git standards).

	- Changed `git_config_get_XX`, `git_config_set_XX`: the `long` and `int` types have
	been replaced by `int64` and `int32` respectively, to make their meaning more
	obvious.

	- Added `git_indexer`: An interface to index Git Packfiles has been added in the
	`git2/indexer.h` header.

	- Changed `git_reflog_entry_XX`: Reflog entries are now returned as `git_oid *` objects
	instead of hexadecimal OIDs.

	- Added `git_remote`: More fetch functionality has been added to the `git2/remote.h`
	functionality. Local, Smart HTTP and Git protocols are now supported.

	- Added `git_repository_head`: Returns the HEAD of the repository.

	- Added `git_repository_config_autoload`: Opens the configuration file of a repository,
	including the user's and the system's global config files, if they can be found.

	- Changed `git_signature_now`: Now returns an error code; the signature is stored by
	reference.