tree b9ee1bc4b9eec6d4124a37805920a7bb1f90ab5c
parent 7d5367e2a8618718e90274ae920bc6f406b59b9e
author Brian Norris <briannorris@chromium.org> 1452556470 -0800
committer chrome-bot <chrome-bot@chromium.org> 1452578591 -0800

fix build against libpng >=1.4

According to the latest libpng manual, png_set_gray_1_2_4_to_8() is
deprecated and should be replaced with png_set_expand_gray_1_2_4_to_8()
(backported to 1.2.9).

Useful in case we ever do update libpng.

BUG=chrome-os-partner:49267
TEST=build

Change-Id: Ifbe7a670b23b8fcb7ffc7e1ebf0e6179a178271f
Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/321471
Reviewed-by: Mike Frysinger <vapier@chromium.org>