From Pere:
Fixes for CMake build.
* #define HAVE___DSO_HANDLE
* compile TClingCallbacks.cxx without rtti
* link rootcling(_tmp) against clib objects as well as dl, thread libs.
* tweak CXXFLAGS for cling: remove -fvisibility-inlines-hidden, -pedantic; add -fno-strict-aliasing


git-svn-id: https://root.cern.ch/svn/root/trunk@48253 27541ba8-7e3a-0410-8455-c3a389f83636