...and get rid of hand-coded queryInterface implementations that use
dynamic_cast.  My claim at <http://lists.cs.uiuc.edu/pipermail/cfe-commits/
Week-of-Mon-20130812/086127.html> "ubsan: check type_info equality via strcmp"
that "there should not be uses of dynamic_cast involving [UNO] classes in the
LibreOffice code base" made me wonder...

Change-Id: Ic7702fd00b8e5c79399124c0acf12c80bc71a86f