darwin: Remove extra kCGLPFAColorSize attribute when requesting an offscreen context

https://xquartz.macosforge.org/trac/ticket/650

Signed-off-by: Jeremy Huddleston Sequoia <jeremyhu@apple.com>
(cherry picked from commit b4f34241ec850fbeffcb3278fea85f06d1666c43)
1 file changed