Add Generator for cygwin/mingw
Please add a generator for cygwin/mingw. This is the version of mingw that is included with cygwin.
The "MinGW Makefiles" generator is for standalone mingw and does NOT work with the mingw toolset included with cygwin.
These binaries either have x86_64-w64-mingw32- or i686-w64-mingw32- added to their EXE names.