Auto merge of #3504 - froydnj:win32-dependencies, r=alexcrichton
authorbors <bors@rust-lang.org>
Fri, 6 Jan 2017 17:16:47 +0000 (17:16 +0000)
committerbors <bors@rust-lang.org>
Fri, 6 Jan 2017 17:16:47 +0000 (17:16 +0000)
make certain dependencies Windows-only

Inspired by servo/heapsize#71, we make certain dependencies only required under Windows.


Trivial merge