Marc Auberer 77118536b5 [libc] Remove obsolete LIBC_HAS_BUILTIN macro (#86554) ...

Fixes #86546 and removes the macro `LIBC_HAS_BUILTIN`. This was
necessary to support older compilers that did not support
`__has_builtin`. All of the compilers we support already have this
builtin.
See: https://libc.llvm.org/compiler_support.html
All uses now use `__has_builtin` directly

cc @nickdesaulniers

2024-03-27 17:22:41 +01:00

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