Louis Dionne 647ddc08f4 [libc++] Add missing __has_include checks for C headers not provided by libc++ ...

This makes the library consistent in how it handles C library headers. For C headers provided by libc++,
we unconditionally include <foo.h> from <cfoo>, and then <foo.h> conditionally include_next <foo.h>.
For headers not provided by libc++, <cfoo> conditionally includes the system's <foo.h> directly.

Differential Revision: https://reviews.llvm.org/D138512

2022-11-23 09:50:14 -05:00

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