use readlink to find real path of where root-config is located. This fixes issues in case root/bin is symlinked.
use readlink to find real path of where root-config is located. This fixes
issues in case root/bin is symlinked.


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@27391 27541ba8-7e3a-0410-8455-c3a389f83636

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