[Egoboo-main] Build fixes for CVS

[M. R. B. <mr...@0x...>]

The following patch allows CVS to build properly.  What is the normal
procedure for submitting patches?  Is the Egoboo CVS tree world-writeable
(I hope not, but the egoboo.sf.net page implied as much)?

I'm currently running into some input handling problems, the joystick input
code seems to be broken (I haven't tested keyboard or mouse yet), and
input.[ch] looks like it's in need of a rewrite anyway, so I'll get on that
soon.

M. R.