quakespasm.pak: add several .ent files to prevent z-fighting

fixed so far:
e1m1: quad secret elevator (when down)
e1m2: exit doors (when open)
e2m3: rockets secret doors (when open)
e2m7: bars in front of the exit doors (when raised)



git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@989 af15c1b1-3010-417e-b628-4374ebc0bcbd
gl_rmain.c: make gl_zfix default to 0, no longer save it to config.cfg


git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@990 af15c1b1-3010-417e-b628-4374ebc0bcbd