SL-17967 - Git rid of ARB that is in core

indra/llrender/llatmosphere.cpp

indra/llrender/llcubemap.cpp

indra/llrender/llcubemaparray.cpp

indra/llrender/llgl.cpp

indra/llrender/llglheaders.h

indra/llrender/llglslshader.cpp

indra/llrender/llglslshader.h

indra/llrender/llimagegl.cpp

indra/llrender/llpostprocess.cpp

indra/llrender/llpostprocess.h

indra/llrender/llrender.cpp

indra/llrender/llrendertarget.cpp

indra/llrender/llshadermgr.cpp

indra/llrender/llshadermgr.h

indra/llrender/llvertexbuffer.cpp

indra/llwindow/llopenglview-objc.mm

indra/newview/llappviewer.cpp

indra/newview/llface.cpp

indra/newview/llglsandbox.cpp

indra/newview/llreflectionmapmanager.cpp