Do not prepend stdext namespace with "::" when calling sizeof, typeid, due to...

Do not prepend stdext namespace with "::" when calling sizeof, typeid, due to MSVC7.1 bug (was already done for namespace std). Fixes nightlies.


git-svn-id: http://root.cern.ch/svn/root/trunk@24092 27541ba8-7e3a-0410-8455-c3a389f83636