changed how QC interpreter handles edict field access - the entvars struct is now...

changed how QC interpreter handles edict field access - the entvars struct is now a pointer - yes this changed that many files...
discovered gcc 2.95.3 is the sole cause of map change crashs in the QC interpreter - it does not compile pr_exec.c correctly somehow (I think OP_ADDRESS is the only place it has a problem), makefile now refers to gcc-3.1 (maybe this should be changed, but oh well for now)

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@2580 d7cf8633-e32d-0410-b094-e92efae38249