Mike Erwin 1beed61b76 OpenGL/GHOST: don't request accum buffer on Mac
This was blocking core context setup on Mac, since accumulation buffers are obsolete. With this (and appropriate CMake options) I now get

renderer:	'Intel HD Graphics 4000 OpenGL Engine'
vendor:		'Intel Inc.'
version:	'4.1 INTEL-10.24.45'

in system-info.txt intead of 

version:	'2.1 INTEL-10.24.45'
2017-04-21 16:04:03 -04:00
2017-04-21 17:14:13 +10:00
2017-04-21 15:51:08 -04:00
2013-12-24 22:57:27 +06:00
2017-02-20 10:16:58 +01:00
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