[Bug 772451] Broken clock_gettime and mkostemp detection with XCode 8

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772451

--- Comment #13 from Nirbheek Chauhan <nirbheek.chauhan at gmail.com> ---
The main issue is that Autoconf detects symbols in libraries by supplying its
own prototype and trying to link to that symbol. This means that the prototype
in the Apple headers is not used and `__CLOCK_AVAILABILITY` is not used at all,
which causes the linker to always find the symbol regardless of whether you use
`-Wl,-no_weak_imports` or `-mmacosx-version-min=10.7`, etc.

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