vala: move to 'Development tools' submenu

vala isn't an X application.

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

package/Config.in

@@ -91,6 +91,7 @@ source "package/sstrip/Config.in"
 if BR2_PACKAGE_BUSYBOX_SHOW_OTHERS
 source "package/tar/Config.in"
 endif
+source "package/vala/Config.in"
 source "package/yasm/Config.in"
 endmenu
 
@@ -160,7 +161,6 @@ source "package/rdesktop/Config.in"
 source "package/sylpheed/Config.in"
 source "package/synergy/Config.in"
 source "package/torsmo/Config.in"
-source "package/vala/Config.in"
 source "package/x11vnc/Config.in"
 source "package/xstroke/Config.in"
 source "package/xterm/Config.in"