Add a Makefile to compile with cl.exe on Windows.
Add a Makefile to compile with cl.exe on Windows.

mstorsjo/c99-to-c89,libav/c99-to-c89,libav/c99-to-c89,mstorsjo/c99-to-c89,rbultje/c99-to-c89,rbultje/c99-to-c89