Auto merge of #4435 - ishitatsuyuki:deps-purge, r=matklad
authorbors <bors@rust-lang.org>
Sat, 26 Aug 2017 10:01:15 +0000 (10:01 +0000)
committerbors <bors@rust-lang.org>
Sat, 26 Aug 2017 10:01:15 +0000 (10:01 +0000)
Purge unused extern crates


Trivial merge