Auto merge of #3230 - alexcrichton:better-download, r=alexcrichton
authorbors <bors@rust-lang.org>
Wed, 26 Oct 2016 02:46:42 +0000 (19:46 -0700)
committerGitHub <noreply@github.com>
Wed, 26 Oct 2016 02:46:42 +0000 (19:46 -0700)
Download mingw from more reliable location

Use the same "mirror" the rust repo uses


Trivial merge