[PATCH] Fixincludes: handle __FLT_EVAL_METHOD__ == 16 on darwin

[FX via Gcc-patches]

Hi,

The darwin system headers error out on __FLT_EVAL_METHOD__ == 16, which
occurs when the compiler is called with -mavx512fp16 on i386. Allow this
value to proceed past the check (nothing else depends on it in the
system headers). See https://gcc.gnu.org/pipermail/gcc/2021-December/237972.html
for details.

We can use fixincludes to fix this.
Bootstrapped on both x86_64-apple-darwin and aarch64-apple-darwin.

OK to commit?

0001-Fixincludes-Handle-__FLT_EVAL_METHOD__-16-on-darwin.patch
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