package/Config.in: sort the real-time menu entries

Reported-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Romain Naour <romain.naour@openwide.fr>
Acked-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/Config.in

@@ -910,8 +910,8 @@ endif
 endmenu
 
 menu "Real-Time"
-source "package/xenomai/Config.in"
 source "package/rtai/Config.in"
+source "package/xenomai/Config.in"
 endmenu
 
 menu "Shell and utilities"