[libcxx] [llvm] [libc++] Format the code base (PR #74334)

[Dimitry Andric via llvm-commits]

DimitryAndric wrote:

On Windows, `<windows.h>` is pretty special, it must usually be the first included header (at least, of the Win32 API related headers). I'm unsure if clang-format can be convinced to never alphabetically sort it.


https://github.com/llvm/llvm-project/pull/74334