BUG: Explicitly disable using octave during Swig configure

Fix: #3294

Also explicitly specify Slicer python to swig configuration.

From: Bradley Lowekamp <blowekamp@mail.nih.gov>

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22479 3bd1e089-480b-0410-8dfb-8563597acbee