include: Rename budg.h to update.h

Signed-off-by: Markus Armbruster <armbru@pond.sub.org>

src/lib/update/nat.c

@@ -35,13 +35,13 @@
 #include <config.h>
 
 #include <math.h>
-#include "budg.h"
 #include "file.h"
 #include "game.h"
 #include "item.h"
 #include "optlist.h"
 #include "prototypes.h"
 #include "nat.h"
+#include "update.h"
 
 /*
  * hap and edu avg mean that the weight on current happiness is