r211604 - Use lowercase windows.h for mingw cross compilation.

[Rafael Espíndola]

On 24 June 2014 17:06, Zachary Turner <zturner at google.com> wrote:
> Couldn't LLVM expose a registry interface on Windows and then the front-end
> could conditionally include this header on Windows?  Other users of LLVM
> might wish to use the registry too.

When they do that would be a reasonable time to add such an interface
to llvm,not before.

Cheers,
Rafael