MacOS X has a very lazy linker, by marking the dictionary setup methods

undefined we force the loading at startup of all libraries referenced during
linking. Also in root-config mark these methods undefined. In TRint it is
now not necessary anymore to dynamically load the libraries that are
specified during linking (was causing libraries to be loaded twice on
other platforms).


git-svn-id: http://root.cern.ch/svn/root/trunk@8943 27541ba8-7e3a-0410-8455-c3a389f83636