COMP: UpdateITKv4 - Fix unused typedefs warnings specific to gcc >= 4.8

$ git shortlog 4c1d191ceac136b920dbb13564c419fc821dd848..ee6472628dcbb12d2723f04dbf3b14764de2b4ff
Matthew McCormick (1):
      COMP: Do not warn about unused typedefs

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22651 3bd1e089-480b-0410-8dfb-8563597acbee