common.h, gl_vidsdl.c, mathlib.h, zone.c, zone.h. added Z_Realloc as a
new function (will be used later.) next step will be type correctness
work in opengl stuff.
git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@33 af15c1b1-3010-417e-b628-4374ebc0bcbd