libpng: Update to 1.6.16

mingw-w64-libpng/PKGBUILD

@@ -2,7 +2,7 @@
 
 _realname=libpng
 pkgname="${MINGW_PACKAGE_PREFIX}-${_realname}"
-pkgver=1.6.15
+pkgver=1.6.16
 pkgrel=1
 arch=('any')
 pkgdesc="A collection of routines used to create PNG format graphics (mingw-w64)"
@@ -15,8 +15,8 @@ options=('strip' '!libtool' 'staticlibs')
 source=("http://downloads.sourceforge.net/sourceforge/libpng/libpng-$pkgver.tar.xz"
         "http://downloads.sourceforge.net/project/libpng-apng/libpng16/$pkgver/libpng-$pkgver-apng.patch.gz")
 
-md5sums=('a95cb387c53215b034203b41ec57c7e5'
-         '612524080d5515f4ea81541a9b13bf61')
+md5sums=('23b7286b5d4a86de950fd2ffc5cac742'
+         '52de72a29e5d0428a0e527be74b99c24')
 
 prepare() {
   cd "$srcdir/libpng-$pkgver"