port windows_sdk.cpp to zig (msvc installation detection)

[andrewrk]

https://github.com/ziglang/zig/blob/master/src/windows_sdk.cpp

https://github.com/ziglang/zig/blob/master/src/windows_sdk.h

https://github.com/ziglang/zig/blob/master/src/windows_com.hpp

This is not a high priority issue but it would be nice to eliminate this dependency on C++.