ENH: Update ITKv4.

Bump ITKv4 this fixes some MetaIO issues:

Stephen Aylward (3):
   BUG: Fixed bugs in Form and hidden virtual funcs in Image
   COMP: Fixed unused variable warnings in tests
   COMP: Disable tests since paths are set wrong in VTK

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22638 3bd1e089-480b-0410-8dfb-8563597acbee