Add MESA_framebuffer_flip_x and MESA_framebuffer_SwapXY
MESA_framebuffer_flip_x and MESA_framebuffer_swap_xy are add to implement rotation feature with MESA_framebuffer_flip_y.
MESA_framebuffer_flip_x and MESA_framebuffer_swap_xy are add to implement rotation feature with MESA_framebuffer_flip_y.