[libc-commits] [libc] [libc][wctype] Add cmake flag for configuring wctype implementation used (PR #170531)

[Muhammad Bassiouni via libc-commits]

https://github.com/bassiounix requested changes to this pull request.

We need to add some description to let people know how to utilize this option with its possible values.
Please add some description in the docs like:
- https://github.com/llvm/llvm-project/blob/035f81138888f30aab67ee12ce09982cd03370cb/libc/docs/configure.rst#L22
- https://github.com/llvm/llvm-project/blob/035f81138888f30aab67ee12ce09982cd03370cb/libc/docs/configure.rst#L40

https://github.com/llvm/llvm-project/pull/170531