[2020-02] Fix iOS sdks build on Xcode 12 #20574
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The new Xcode introduced functions like preadv/pwritev in the SDK that get erraneously detected by autoconf even though we can't use them. Disable these functions and also add a check for Xcode version to workaround mono#19393.
vargaz
approved these changes
Nov 13, 2020
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The new Xcode introduced functions like preadv/pwritev in the SDK that get erraneously detected by autoconf even though we can't use them.
Disable these functions and also add a check for Xcode version to workaround #19393.
Backport of #20573.
/cc @akoeplinger