update server: Move update_running from server/ to update/

update.h is a more logical home for update_running than server.h.
Move the definition and the assignments along, from server/update.c to
lib/update/main.c.

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

src/lib/subs/wu.c

@@ -43,8 +43,8 @@
 #include "optlist.h"
 #include "player.h"
 #include "prototypes.h"
-#include "server.h"
 #include "tel.h"
+#include "update.h"
 
 static struct telstr last_tel[MAXNOC];