[libc][math] Refactor acosf implementation to header-only in src/__support/math folder. #148411
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Part of #147386
in preparation for: https://discourse.llvm.org/t/rfc-make-clang-builtin-math-functions-constexpr-with-llvm-libc-to-support-c-23-constexpr-math-functions/86450
Please merge #148409 first