[libcxx-commits] [libcxx] [libc++] Revert "Do not redeclare lgamma_r when targeting the LLVM C library (#102036) (PR #125587)

[Joseph Huber via libcxx-commits]

jhuber6 wrote:

Might need to check for `__AMDGPU__` and `__NVPTX__` or something, since this is what lets us use `lgamma` and stuff. alternatively we could replace this with a cmake check that just sees if the environment can call `lgamma_r`.

https://github.com/llvm/llvm-project/pull/125587