add test for MacOS X 10.8 in case X11 is not yet installed (don't try to execute the xstub script).
add test for MacOS X 10.8 in case X11 is not yet installed (don't try
to execute the xstub script).


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@44829 27541ba8-7e3a-0410-8455-c3a389f83636

bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical