sane-backends: upgraded package to upstream

Upgraded media-gfx/sane-backends to version 1.0.25 for all

BUG=chromium:550311
TEST=pre-cq passes

Change-Id: Ic47f961503966012dda5e3fb23026a55e8fafb19
Previous-Reviewed-on: https://chromium-review.googlesource.com/310560
(cherry picked from commit 1f29bdf7b034b03ea9a072e6ad98646edaf4ecdd)
Reviewed-on: https://chromium-review.googlesource.com/311281
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
8 files changed