backend-x11: split x11_output_get_pixel_format out of x11_output_init_shm
Split x11_output_get_pixel_format() out of x11_output_init_shm() so the pixel format can already be known when calling pixman->output_create().
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Split x11_output_get_pixel_format() out of x11_output_init_shm() so the pixel format can already be known when calling pixman->output_create().