Follow-up to r37562:
Follow-up to r37562:

* build/generator/gen_win.py
  (WinGeneratorBase._find_swig): Don't use syntax which is supported only by
   Python >=2.5.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion