* build/generator/gen_win.py: Add missing import. Followup to r17933.
* build/generator/gen_win.py: Add missing import. Followup to r17933.

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