[merge][1.8][#277481] set -DWIN32 when compiling all pyrex extensions

[Bundle Buggy]

Bundle Buggy has detected this merge request.

For details, see: 
http://bundlebuggy.aaronbentley.com/project/bzr/request/%3Ce01316480810071817i67e78bddg49b4aa482901b6%40mail.gmail.com%3E
Project: Bazaar