libgtk2: bump version

Tarball is (so far?) only available as .xz

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/libgtk2/libgtk2.mk

@@ -4,10 +4,10 @@
 #
 #############################################################
 LIBGTK2_VERSION_MAJOR = 2.24
-LIBGTK2_VERSION_MINOR = 8
+LIBGTK2_VERSION_MINOR = 9
 LIBGTK2_VERSION = $(LIBGTK2_VERSION_MAJOR).$(LIBGTK2_VERSION_MINOR)
 
-LIBGTK2_SOURCE = gtk+-$(LIBGTK2_VERSION).tar.bz2
+LIBGTK2_SOURCE = gtk+-$(LIBGTK2_VERSION).tar.xz
 LIBGTK2_SITE = http://ftp.gnome.org/pub/gnome/sources/gtk+/$(LIBGTK2_VERSION_MAJOR)
 LIBGTK2_AUTORECONF = NO
 LIBGTK2_INSTALL_STAGING = YES