IE Config : Update USD install paths.
IE Config : Update USD install paths.

I'm not clear why these are being specified, but maybe its necessary?

andrewkaufman/gaffer,GafferHQ/gaffer,ImageEngine/gaffer,hradec/gaffer,appleseedhq/gaffer,appleseedhq/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,johnhaddon/gaffer,boberfly/gaffer,johnhaddon/gaffer,hradec/gaffer,boberfly/gaffer,GafferHQ/gaffer,hradec/gaffer,johnhaddon/gaffer,andrewkaufman/gaffer,boberfly/gaffer,lucienfostier/gaffer,appleseedhq/gaffer,boberfly/gaffer,andrewkaufman/gaffer,hradec/gaffer,GafferHQ/gaffer,hradec/gaffer,ImageEngine/gaffer,lucienfostier/gaffer,ImageEngine/gaffer,ImageEngine/gaffer,appleseedhq/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,andrewkaufman/gaffer,lucienfostier/gaffer,johnhaddon/gaffer,lucienfostier/gaffer