Adel Gadllah 630a2c5edc backend-glx: Provide copy_sub_buffer fallback
Currently glXCopySubBufferMESA is used for sub stage redraws, but in case
a driver does not support GLX_MESA_copy_sub_buffer we fall back to redrawing
the complete stage which isn't really optimal.

So instead to directly fallback to complete redraws try using GL_EXT_framebuffer_blit
to do the BACK to FRONT buffer copies.

http://bugzilla.openedhand.com/show_bug.cgi?id=2128
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