adding test to check if gccxml is available, including standard ROOT headers in dictionary header
adding test to check if gccxml is available, including standard ROOT headers in dictionary header


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@13669 27541ba8-7e3a-0410-8455-c3a389f83636

bbannier/ROOT,dawehner/root,bbannier/ROOT,dawehner/root,bbannier/ROOT,bbannier/ROOT,dawehner/root,dawehner/root,dawehner/root,bbannier/ROOT,dawehner/root,dawehner/root,bbannier/ROOT,dawehner/root,bbannier/ROOT