Auto merge of #3980 - Keruspe:master, r=alexcrichton
authorbors <bors@rust-lang.org>
Sun, 30 Apr 2017 08:23:23 +0000 (08:23 +0000)
committerbors <bors@rust-lang.org>
Sun, 30 Apr 2017 08:23:23 +0000 (08:23 +0000)
update libgit2-sys for libressl compat


Trivial merge