[PATCH] util: pass sysstrs to warnings.filterwarnings

[Yuya Nishihara]

On Thu, 13 Apr 2017 13:16:10 -0400, Augie Fackler wrote:
> # HG changeset patch
> # User Augie Fackler <augie at google.com>
> # Date 1492103569 14400
> #      Thu Apr 13 13:12:49 2017 -0400
> # Node ID a34b5e7c66830e2f13e4ec32f7abbd64a06a5b8a
> # Parent  f23d579a5a04e44f5e0370ba13ad20dd626e8ad7
> util: pass sysstrs to warnings.filterwarnings
> 
> Un-breaks the Python 3 build.

Doh, queued, thanks.