[quake3] build system

[Ryan C. Gordon]

> Personally I'm very much in favor of the GNU autotools (since I've
> recently learned them and they don't feel like magic anymore).

The problem is that someone always decides they are suddenly competent
at autotools, converts a project, and vanihses. Then the rest of us are
helpless when "configure/make/make install" stops working.

The Makefile is FINE, don't make this harder than it needs to be.

--ryan.