localize menu routines

Keep state loal into drag_menu() in menu.c, rather than in global
variables around menu.c and main.c

client.c

@@ -19,7 +19,6 @@ extern struct Library *XLibBase;
 extern Display *dpy;
 extern XContext client_context, screen_context;
 extern Client *activeclient;
-extern Scrn *menuactive;
 extern void setfocus(Window);
 
 Client *clients=NULL;
@@ -322,8 +321,6 @@ void rmclient(Client *c)
       closescreen();
     scr = c->scr;
     if(c->active) {
-      if(!menuactive)
-	setfocus(None);
       c->active=False;
       activeclient = NULL;
       XInstallColormap(dpy, scr->cmap);