Cleaning QMAKE_LFLAGS_RPATH is not needed anymore

git-svn-id: file:///srv/repos/svn-packages/svn@228077 eb2447ed-0c53-47e4-bac8-5bc4a241df78
Qt now enables 'full optimization' and this does not apply anymore, see https://qt.gitorious.org/qt/qtbase/commit/cd652500af18671e0d64b30d51c79a0c45b973a3

git-svn-id: file:///srv/repos/svn-packages/svn@228078 eb2447ed-0c53-47e4-bac8-5bc4a241df78