Auto merge of #5686 - alexcrichton:beta-next, r=alexcrichton
authorbors <bors@rust-lang.org>
Thu, 5 Jul 2018 21:21:31 +0000 (21:21 +0000)
committerbors <bors@rust-lang.org>
Thu, 5 Jul 2018 21:21:31 +0000 (21:21 +0000)
[beta] Fix `cargo install` using a workspace target dir

Backport of https://github.com/rust-lang/cargo/pull/5685


Trivial merge