In addition to the existing GL_APPLE_ycbcr_422. Core contexts on Mac OS don't
advertise GL_APPLE_fence or GL_APPLE_ycbcr_422... but they do have
GL_APPLE_flush_render and GL_APPLE_rgb_422. So, go back to using
GL_APPLE_flush_render in our OS X detection, and accept GL_APPLE_rgb_422 in
addition to GL_APPLE_ycbcr_422.
Signed-off-by: Chip Davis <cdavis@codeweavers.com>
Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>