package/zlib: bump version to 1.2.10

Changed _SITE url to the upstream project site because Sourceforge does
not provide the tarball for 1.2.10 as of now.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/zlib/zlib.hash

@@ -1,2 +1,2 @@
 # From http://www.zlib.net/
-md5	28f1205d8dd2001f26fec1e8c2cebe37	zlib-1.2.8.tar.xz
+sha256 9612bf086047078ce3a1c154fc9052113fc1a2a97234a059da17a6299bd4dd32  zlib-1.2.10.tar.xz

package/zlib/zlib.mk

@@ -4,9 +4,9 @@
 #
 ################################################################################
 
-ZLIB_VERSION = 1.2.8
+ZLIB_VERSION = 1.2.10
 ZLIB_SOURCE = zlib-$(ZLIB_VERSION).tar.xz
-ZLIB_SITE = http://downloads.sourceforge.net/project/libpng/zlib/$(ZLIB_VERSION)
+ZLIB_SITE = http://www.zlib.net
 ZLIB_LICENSE = zlib license
 ZLIB_LICENSE_FILES = README
 ZLIB_INSTALL_STAGING = YES