gdk-pixbuf: upgrade to 2.28.1

Something along the lines of pngversion.patch was merged upstream, so drop that
patch.

Also use the new trim_version() function for a future-proof SRC_URI.

(From OE-Core rev: 30b32addd189e7acce73965c9176227d5f392ab9)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-gnome/gdk-pixbuf/gdk-pixbuf-2.26.5/pngversion.patch

@@ -1,23 +0,0 @@
-We now have libpng 1.6. If we build libpng12 as well as libpng 1.6, the 1.2 version gets 
-preferred which is not desirable and does not give deterministic builds.
-
-We really do want to use libpng since the item in DEPENDS will provide this so
-manipulate the search list so the one we DEPEND on gets chosen.
-
-RP 2013/4/13
-
-Upstream-Status: Pending [worth discussing at least]
-
-Index: gdk-pixbuf-2.26.5/configure.ac
-===================================================================
---- gdk-pixbuf-2.26.5.orig/configure.ac	2013-03-26 15:45:16.594820303 +0000
-+++ gdk-pixbuf-2.26.5/configure.ac	2013-04-13 10:15:19.241433789 +0000
-@@ -588,7 +588,7 @@
- 
- dnl Test for libpng
-   if test x$with_libpng != xno && test -z "$LIBPNG"; then
--    for l in libpng15 libpng14 libpng12 libpng13 libpng10 libpng ; do
-+    for l in libpng libpng15 libpng14 libpng12 libpng13 libpng10 ; do
-       AC_MSG_CHECKING(for $l)
-       if $PKG_CONFIG --exists $l ; then
-         AC_MSG_RESULT(yes)

meta/recipes-gnome/gdk-pixbuf/gdk-pixbuf_2.28.1.bb

@@ -11,17 +11,16 @@ SECTION = "libs"
 DEPENDS = "libpng glib-2.0 jpeg"
 DEPENDS_append_linuxstdbase = " virtual/libx11"
 
-SRC_URI = "http://ftp.acc.umu.se/pub/GNOME/sources/gdk-pixbuf/2.26/gdk-pixbuf-${PV}.tar.xz \
+MAJ_VER = "${@oe.utils.trim_version("${PV}", 2)}"
+
+SRC_URI = "${GNOME_MIRROR}/${BPN}/${MAJ_VER}/${BPN}-${PV}.tar.xz \
            file://hardcoded_libtool.patch \
            file://configure_fix.patch \
            file://extending-libinstall-dependencies.patch \
-           file://pngversion.patch \
            "
 
-SRC_URI[md5sum] = "339329e6d619ee3e1cb93979111b04c0"
-SRC_URI[sha256sum] = "77696fd163bca95a130a1883dbd78d0ae4d782de2fc85a9a38556d13681f5c84"
-
-PR = "r1"
+SRC_URI[md5sum] = "5c71cce316d08c559fc5970aa60754ab"
+SRC_URI[sha256sum] = "bea0b743fdb5c3c8e23210f73623ec5f18f9ead2522942897fe739d80b50c2bb"
 
 inherit autotools pkgconfig gettext pixbufcache