Fixes https://github.com/mono/mono/issues/15503
Always statically link on Windows (msvc and mingw).
This is a somewhat old zlib, and will be updated shortly (https://github.com/mono/mono/pull/15480)
Note that zlib is not valid C++, so always compile as C.
* Exclude a couple of sources currently not building anything useful on Windows.
* Added MONO_EMTPY_SOURCE_FILE to a couple of source files ending up empty by default.
* Excluded API's not included on UWP targets.
* Explicitly declared import project paths in target files.
* Added support to define x64 MASM build outside default targets file.