fix compilation without INET

sys/net/if_spppsubr.c

@@ -1,4 +1,4 @@
-/*	$NetBSD: if_spppsubr.c,v 1.11 2000/07/02 17:38:09 sommerfeld Exp $	 */
+/*	$NetBSD: if_spppsubr.c,v 1.12 2000/10/02 03:53:47 itojun Exp $	 */
 
 /*
  * Synchronous PPP/Cisco link level subroutines.
@@ -61,20 +61,18 @@
 
 #include <machine/stdarg.h>
 
-#ifdef INET
 #include <netinet/in.h>
 #include <netinet/in_systm.h>
 #include <netinet/in_var.h>
+#ifdef INET
 #include <netinet/ip.h>
 #include <netinet/tcp.h>
+#endif
 #if defined (__FreeBSD__) || defined (__OpenBSD__)
 #include <netinet/if_ether.h>
 #else
 #include <net/ethertypes.h>
 #endif
-#else
-#error Huh? sppp without INET?
-#endif
 
 #ifdef IPX
 #include <netipx/ipx.h>
@@ -258,6 +256,7 @@ static struct callout_handle keepalive_ch;
 #define	SPP_ARGS(ifp)	(ifp)->if_xname
 #endif
 
+#ifdef INET
 /*
  * The following disgusting hack gets around the problem that IP TOS
  * can't be set yet.  We want to put "interactive" traffic on a high
@@ -271,6 +270,7 @@ static u_short interactive_ports[8] = {
 	0,	21,	0,	23,
 };
 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
+#endif
 
 /* almost every function needs these */
 #define STDDCL							\