This glsl shader works for OCIO with alpha. OSX iMac with ATI.

There's no logical reason I can find... but I commit it because many others have
the same error, so we can check.



git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56356 954f8c5b-7b00-dc11-b283-0030488c597c