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darwin: Ensure errors on unguarded use of new APIs, require macOS 10.13

Nirbheek Chauhan requested to merge nirbheek/cerbero:unguarded-usage into main

APIs that are only available on newer macOS versions need to be guarded with __builtin_available for a runtime check that won't load the symbol at all on older OS versions.

Split out of !1108 (merged) because there are a lot of failures:

../gio/glocalfileinfo.c:2779:9: error: 'utimensat' is only available on macOS 10.13 or newer [-Werror,-Wunguarded-availability-new]
  res = utimensat (AT_FDCWD, filename, times_n, 0);

and more.

Edited by Nirbheek Chauhan

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