Since CINT cannot load libMathCore on demand when a global is used

(like gRandom) we load libMathCore explicitly. Smart linkers (Ubuntu 11, AIX)
strip unused libs and force linking by undefining a symbol on the command line
is ugly.


git-svn-id: http://root.cern.ch/svn/root/trunk@41833 27541ba8-7e3a-0410-8455-c3a389f83636