[PATCH 01 of 11] util: add tryunlink function

[Yuya Nishihara]

On Tue, 21 Mar 2017 06:54:23 -0700, Ryan McElroy wrote:
> # HG changeset patch
> # User Ryan McElroy <rmcelroy at fb.com>
> # Date 1490104228 25200
> #      Tue Mar 21 06:50:28 2017 -0700
> # Node ID 5c9cdd8046845f76e169885ed490a603b911d0d4
> # Parent  49de4dfb282e2ad4dc91328ffd7fc396ee92b4a0
> util: add tryunlink function

Also looks good. Queued, thanks.