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add runtime checks for MACOSX_DEPLOYMENT_TARGET=10.10
In order to support a universal2 build, supporitng Mac OS 11 on arm64 and Mac OS on
x86_64 going back to 10.10, we need to add in runtime checks for functions that will
be detected as present by autoconf, because they are in the SDK, but which did not
exist  in Mac OS 10.10.    This fixes all the instances of -WWunguarded-availability-new
when building with MACOSX_DEPLOYMENT_TARGET=10.10
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lawrence-danna-apple committed Jul 21, 2020
commit 5d4878c1c1a3066d310402136a46730f8efec4eb
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