Auto merge of #5604 - debris:issue_5602, r=matklad
authorbors <bors@rust-lang.org>
Mon, 4 Jun 2018 08:04:20 +0000 (08:04 +0000)
committerbors <bors@rust-lang.org>
Mon, 4 Jun 2018 08:04:20 +0000 (08:04 +0000)
fixed 5602, expose cached build script output in json output

fixes #5602


Trivial merge