From: bors <bors@rust-lang.org>
Date: Wed, 7 Mar 2018 15:39:24 +0000 (+0000)
Subject: Auto merge of #5012 - infinity0:pr4988, r=alexcrichton
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Auto merge of #5012 - infinity0:pr4988, r=alexcrichton

Don't require dev-dependencies when not needed in certain cases

Specifically, when running `cargo install` and add a flag for this behaviour in `cargo build`.

This closes #4988.
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879f48324d52c78322b6ad7513999b2a651c5023