Add support for .mc files in CygwinCCompiler+MinGW32Compiler / Add support for windmc compiling routine

[Avasam]

Port of pypa/setuptools#4742 from @raedrizqie with added type hints and deduplicated try-catch

I noticed this compiler was missing support whilst trying to add first-party MinGW support to pywin32.

Tested at:

• build_msys2_mingw Avasam/pywin32#24
• Fix mingw compiler detection with cross-compilation mhammond/pywin32#2743

[Avasam]

Not sure if I'm overcomplicating and should just do:

Suggested change

	self.cc, self.cxx, self.rc, self.mc = get_config_vars(
	'CC', 'CXX', 'WINDRES', 'WINDMC'
	)
	# Override 'CC' and 'CXX' environment variables for
	# Override environment variables for
	# building using MINGW compiler for MSVC python.
	self.cc = os.environ.get('CC', self.cc or 'gcc')
	self.cxx = os.environ.get('CXX', self.cxx or 'g++')
	self.rc = os.environ.get( # resource compiler
	"WINDRES", cast('str', self.rc) or "windres"
	)
	self.mc = os.environ.get( # message compiler
	"WINDMC", cast('str', self.mc) or "windmc"
	)
	self.cc, self.cxx = get_config_vars('CC', 'CXX')
	# Override 'CC' and 'CXX' environment variables for
	# building using MINGW compiler for MSVC python.
	self.cc = os.environ.get('CC', self.cc or 'gcc')
	self.cxx = os.environ.get('CXX', self.cxx or 'g++')
	self.rc = os.environ.get("WINDRES", "windres") # resource compiler
	self.mc = os.environ.get("WINDMC", "windmc") # message compiler