security update to latest stable upstream version

package/libpng/Makefile

@@ -4,9 +4,9 @@
 include ${TOPDIR}/rules.mk
 
 PKG_NAME:=		libpng
-PKG_VERSION:=		1.2.36
+PKG_VERSION:=		1.2.44
 PKG_RELEASE:=		1
-PKG_MD5SUM:=		4779cd011409ea9b591e11638781f0bf
+PKG_MD5SUM:=		89b62f8daaeeab1342e307d6d1411ff1
 PKG_DESCR:=		A library for reading/writing PNG images
 PKG_SECTION:=		libs
 PKG_DEPENDS:=		zlib

package/libtiff/Makefile

@@ -4,9 +4,9 @@
 include ${TOPDIR}/rules.mk
 
 PKG_NAME:=		libtiff
-PKG_VERSION:=		3.8.2
+PKG_VERSION:=		3.9.4
 PKG_RELEASE:=		1
-PKG_MD5SUM:=		fbb6f446ea4ed18955e2714934e5b698
+PKG_MD5SUM:=		2006c1bdd12644dbf02956955175afd6
 PKG_DESCR:=		A library for reading/writing TIFF images
 PKG_SECTION:=		libs
 PKG_URL:=		http://www.libtiff.org