Auto merge of #2830 - munyari:rustc-env, r=alexcrichton
authorbors <bors@rust-lang.org>
Sun, 10 Jul 2016 06:36:03 +0000 (23:36 -0700)
committerGitHub <noreply@github.com>
Sun, 10 Jul 2016 06:36:03 +0000 (23:36 -0700)
Set environment variable for rustc in custom_build.rs

Addresses #2819


Trivial merge