[libc-commits] [libc] [libc] Create a separate proxy header for math-function-macros.h (PR #98430)

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lntue wrote:

> @lntue do you have any idea why there are some erros with undeclared identifier? I see the file FPBits.h is included.

The failure in `explogxf_test` is because the fully qualified name for `FPBits` template is `LIBC_NAMESPACE::fputil::FPBits<T>`, which is not defined / aliased in that test.

https://github.com/llvm/llvm-project/pull/98430