Auto merge of #5607 - ehuss:config-rustc, r=matklad
authorbors <bors@rust-lang.org>
Mon, 4 Jun 2018 15:10:04 +0000 (15:10 +0000)
committerbors <bors@rust-lang.org>
Mon, 4 Jun 2018 15:10:04 +0000 (15:10 +0000)
Remove some minor, unused code.

I think this was left behind as part of #5359.


Trivial merge