Alexandre Julliard : configure: Add a pkg-config check for libpng.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: b9921eb3701912b965d1d39b09083c034afced26
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=b9921eb3701912b965d1d39b09083c034afced26

Author: Alexandre Julliard <julliard at winehq.org>
Date:   Thu May 16 16:47:16 2013 +0200

configure: Add a pkg-config check for libpng.

---

 aclocal.m4                     |    4 +-
 configure                      |  171 ++++++++--------------------------------
 configure.ac                   |   46 +++++------
 dlls/windowscodecs/Makefile.in |    2 +-
 4 files changed, 55 insertions(+), 168 deletions(-)

Diff:   http://source.winehq.org/git/wine.git/?a=commitdiff;h=b9921eb3701912b965d1d39b09083c034afced26