Added steps to compile.py to compile the C code. Make sure you have CFLAGS, CPPFLAGS, and LDFLAGS set up as necessary to find the libraries and header files before calling compile.py.

Tested in MinGW Shell on a machine where the libraries and header files are all set up.

Issue https://github.com/NAVADMC/SpreadModel/issues/236
Merge branch 'Windows' of https://github.com/NAVADMC/SpreadModel into Windows