Auto merge of #3847 - SergioBenitez:master, r=alexcrichton
authorbors <bors@rust-lang.org>
Wed, 12 Apr 2017 19:03:16 +0000 (19:03 +0000)
committerbors <bors@rust-lang.org>
Wed, 12 Apr 2017 19:03:16 +0000 (19:03 +0000)
Always emit build script warnings for crates that fail to build

Resolves #3777.

r? @alexcrichton


Trivial merge