Contribs: update png to 1.2.44

CVE inside.
(cherry picked from commit c1a7d8e396f7ece5e90309b0c460911f7a8ed37f)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

extras/contrib/src/packages.mak

@@ -139,7 +139,7 @@ VCDIMAGER_VERSION=0.7.23
 VCDIMAGER_URL=$(GNU)/vcdimager/vcdimager-$(VCDIMAGER_VERSION).tar.gz
 CDIO_VERSION=0.80
 CDIO_URL=$(GNU)/libcdio/libcdio-$(CDIO_VERSION).tar.gz
-PNG_VERSION=1.2.43
+PNG_VERSION=1.2.44
 PNG_URL=$(SF)/libpng/libpng-$(PNG_VERSION).tar.bz2
 GPGERROR_VERSION=1.7
 #GPGERROR_URL=$(CONTRIB_VIDEOLAN)/libgpg-error-$(GPGERROR_VERSION).tar.bz2