Tweaked the #define's of GL_ALPHA_MIN_SGIX and GL_ALPHA_MAX_SGIX to ensure compilation across OGL drivers.
Tweaked the #define's of GL_ALPHA_MIN_SGIX and GL_ALPHA_MAX_SGIX to ensure compilation across
OGL drivers.


artoolkit/osg,stmh/osg,ghub/osg,koshman86/osg,omega-hub/osg,omega-hub/osg,omega-hub/osg,XiaoCC/osg,ghub/osg,XiaoCC/osg,ntoand/osg,stmh/osg,omega-hub/osg,XiaoCC/osg,stmh/osg,XiaoCC/osg,koshman86/osg,artoolkit/osg,artoolkit/osg,artoolkit/osg,koshman86/osg,ghub/osg,ntoand/osg,koshman86/osg,ntoand/osg,stmh/osg,XiaoCC/osg,ntoand/osg,ghub/osg,stmh/osg