crOpenGL: add some extensions required for wined3d+wddm
crOpenGL: rever back to 8 texture untits, to avoid memory overwrite in some code parts
crOpenGL: add GL_ARB_pixel_buffer_object support
crOpenGL: fix host gpu crashes when running realflight3d g4 demo in guest
crOpenGL: up max texture size to 8192x8192
crOpenGL: linux, fixes for compiz to work
crOpenGL: export to OSE