Add missing sc_pil_intr_enable member to pccbb_softc.

XXX Double check this, please.  The code appears to only use it as a
boolean, but...

sys/dev/pci/pccbbvar.h

@@ -1,4 +1,4 @@
-/*	$NetBSD: pccbbvar.h,v 1.7 2000/03/01 23:40:26 thorpej Exp $	*/
+/*	$NetBSD: pccbbvar.h,v 1.8 2000/03/12 01:15:04 thorpej Exp $	*/
 /*
  * Copyright (c) 1999 HAYAKAWA Koichi.  All rights reserved.
  *
@@ -170,6 +170,7 @@ struct pccbb_softc {
 
 	/* interrupt handler list on the bridge */
 	struct pccbb_intrhand_list *sc_pil;
+	int sc_pil_intr_enable;
 };
 
 /*