From Gerri:

This is the patch to export the library extension to found_ext in 
check_library() and to use it to set -DLT_MODULE_EXT=\".dylib\" as
compilation flag for the modules using xrootd.


git-svn-id: http://root.cern.ch/svn/root/trunk@44066 27541ba8-7e3a-0410-8455-c3a389f83636