libgtk2: Fix pixbuf loaders cache file generation

After libgtk was bumped to 2.22.0 default loacation of
pixbuf loaders cache changed.
Use --update-cache flag for gdk-pixbuf-query-loaders
which does waht we need.

Signed-off-by: Paulius Zaleckas <paulius.zaleckas@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/libgtk2/S26libgtk2

@@ -2,13 +2,12 @@
 #
 # run pgdk-pixbuf-query-loaders if needed
 
-FILE=/etc/gtk-2.0/gdk-pixbuf.loaders
+FILE=/usr/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache
 
 case "$1" in
     start|"")
 	if [ ! -f "$FILE" ] ; then
-	    mkdir -p /etc/gtk-2.0
-	    /usr/bin/gdk-pixbuf-query-loaders > "$FILE"
+	    /usr/bin/gdk-pixbuf-query-loaders --update-cache
 	fi
 	;;
     stop)