docs/macos: Update for recent Mesa changes
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Default c_std is now c11, no need to workaround 89b4f337 ("c_std=c11 in meson default_options")
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gallium-xlib has been renamed to xlib: 76791db0 ("mesa/x11: Remove the swrast-classic-based fake libGL")
Signed-off-by: Alyssa Rosenzweig alyssa@rosenzweig.io