hg: jdk/sandbox: Filter out stderr warning about deprecation.

[magnus.ihse.bursie at oracle.com]

Changeset: 7f3d846038fc
Author:    ihse
Date:      2018-11-23 12:20 +0100
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/7f3d846038fc

Filter out stderr warning about deprecation.

! make/scripts/pandoc-manpage-filter.sh.template