Switched cmake build from using buildSwigWrapperClases.py to the cleaned up version.

This change does not introduce static bindings.  It is simply using
the pylinted cleaned up code in prepare_bindings.py.

If this breaks anyting, I'll revert immediately and figure out what
needs to be addressed.  I'm looking to wrap up
the cleanup aspect of the code change (pylinted, removal of code that
implements existing python stdlib code, fixes for Xcode adoption, etc.).

llvm-svn: 253478