Auto merge of #4148 - Keruspe:rust-1.19.0, r=alexcrichton
authorbors <bors@rust-lang.org>
Thu, 8 Jun 2017 20:03:10 +0000 (20:03 +0000)
committerbors <bors@rust-lang.org>
Thu, 8 Jun 2017 20:03:10 +0000 (20:03 +0000)
Include rustc version in metadata

This is a backport of #4139 for rust 1.19


Trivial merge