Update libcxx/www/results.Windows.html? (was: Update the MSVC Compatibility document)

Hi all,

Thanks for the great work and congratulations for the great improve of

Is there anyone still working on or testing the Windows version of
libcxx? It is really appreciated if someone could update

(I'm not able to volunteer to do it right now due to limited time, but
I'll keep watching it and see if I can help in the future.)

Thanks a lot and keep the great work!

A long-term goal of mine is a set of buildbots running the libc++ tests more or less continuously. Windows, Mac OS X, Linux, Android, FreeBSD, etc.

— Marshall

Hi Marshall,