[libcxx-commits] [libcxx] [libcxx] avoid include Uppercase windows headers (PR #208903)

[Martin Storsjö via libcxx-commits]

https://github.com/mstorsjo approved this pull request.

LGTM.

We generally (across all of LLVM) use all-lowercase forms to include Windows headers, which works the same across both mingw headers and official WinSDK. This, both because mingw is all lowercase, and because WinSDK isn't self-consistent with how it names/includes its own headers.

https://github.com/llvm/llvm-project/pull/208903