Currently has some kind of bug causing a program link error with no message.
gl_rmain.c
added post processing code, for waterwarp
gl_draw.c
glquake.h
initialises a texture number for use in post processing
gl_vidcommon.c
added function pointer for qglCopyTexImage2D
and its intialisation
glquake.h
put Cl before Co in the defines of gl* to qgl*
gl_rmain.c
glquake.h
gl_vidcommon.c
added a function in gl_rmain.c to init the shaders for post processing, and called it from GL_CheckExtensions
git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@769 fc73d0e0-1445-4013-8a0c-d673dee63da5