From: bors <bors@rust-lang.org>
Date: Mon, 15 May 2017 18:34:40 +0000 (+0000)
Subject: Auto merge of #3929 - Xion:master, r=alexcrichton
X-Git-Tag: archive/raspbian/0.35.0-2+rpi1~3^2^2^2^2^2^2^2~22^2~9^2~36
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Auto merge of #3929 - Xion:master, r=alexcrichton

Allow cargo:rustc-env in build scripts

This is an attempt to address issue #2875. Basically, I'm trying to allow build scripts to produce`cargo:rustc-env=FOO=foo` lines in their output. These are then translated to `env!()`-friendly env. vars that rustc is run with.
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00af72eec30dafbd3797f7c4728c77c064632b55