To compile the game, link all the .cpp files together with the Allegro,
AllegroGL, OpenGL, GLU, and DUMB libraries.

MinGW32 and Linux GCC makefiles are provided for your convenience; run
	make -f makefile.mgw
or
	make -f makefile.lnx
depending on taste. Please note that, according to tradition, the linux makefile
has been left completely untested.
