debug: Improve fcntl.h fortify warnings with clang
It improves open, open64, openat, and openat64. The compile and runtime checks have similar coverage as with GCC. Checked on aarch64, armhf, x86_64, and i686. Reviewed-by:Carlos O'Donell <carlos@redhat.com> Tested-by:
Carlos O'Donell <carlos@redhat.com>
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