Linux build works...

Verified to build under BASH. Linux users will need to delete three lines and uncomment three lines in the cpp2mxmlc.mak file to make it work. There's no test in the Windows version of Make to determine how buggered backslashes are in the mkdir calls, and to decide which 'if not exist' test should be called at the end. Maybe I'll figure out a 'better way' some day, or maybe I'll just live with it.