Auto merge of #4116 - alexcrichton:enotsupp, r=Mark-Simulacrum
authorbors <bors@rust-lang.org>
Thu, 1 Jun 2017 21:07:58 +0000 (21:07 +0000)
committerbors <bors@rust-lang.org>
Thu, 1 Jun 2017 21:07:58 +0000 (21:07 +0000)
Ignore ENOTSUP in file locking on Linux too

Apparently there are some filesystems that return this!

Closes #4096


Trivial merge