Add missing -I so that probe_keyboard.c can find <i386/isa/kbdio.h>. :-(

(Why, oh why did this include file end up in isa/ rather than include/ ?)

sys/i386/boot/rawboot/Makefile

@@ -1,4 +1,4 @@
-#	$Id: Makefile,v 1.2 1996/10/14 17:25:53 pst Exp $
+#	$Id: Makefile,v 1.3 1996/10/15 16:26:05 bde Exp $
 #
 
 PROG=	boot
@@ -16,6 +16,7 @@ CFLAGS=		-O2 -malign-functions=0 -malign-jumps=0 -malign-loops=0 \
 		-I${.CURDIR}/../biosboot \
 		-DBOOTWAIT=${BOOTWAIT} -DTIMEOUT=${TIMEOUT}
 CFLAGS+=	-DBOOTSEG=${BOOTSEG} -DBOOTSTACK=${BOOTSTACK}
+CFLAGS+=	-I${.CURDIR}/../../..
 CFLAGS+=	${CWARNFLAGS}
 
 # Probe the keyboard and use the serial console if the keyboard isn't found.