fix kuhl_gen_framebuffer() call in ogl3-prerend.c
fix kuhl_gen_framebuffer() call in ogl3-prerend.c

runewake2/opengl-examples,JohnRThomas/opengl-examples,JohnRThomas/opengl-examples,JohnRThomas/opengl-examples,runewake2/opengl-examples,runewake2/opengl-examples,JohnRThomas/opengl-examples,runewake2/opengl-examples