Allow to shutdown the following warning:
...backward_warning.h:28:2: warning: #warning This file includes at
least one deprecated or antiquated header which may be removed without
 further notice at a future date. Please use a non-deprecated interface
with equivalent functionality instead. For a listing of replacement
headers and interfaces, consult the file backward_warning.h. To disable
this warning use -Wno-deprecated.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@15184 3bd1e089-480b-0410-8dfb-8563597acbee