Make standalone in_cksum work on little-endian machines, too, courtesy of

Jeff Smith, <jeffs@geocast.com>.

sys/lib/libsa/in_cksum.c

@@ -1,4 +1,4 @@
-/*	$NetBSD: in_cksum.c,v 1.5 2000/03/30 12:19:48 augustss Exp $	*/
+/*	$NetBSD: in_cksum.c,v 1.6 2000/03/31 19:55:09 castor Exp $	*/
 
 /*
  * Copyright (c) 1992 Regents of the University of California.
@@ -52,6 +52,8 @@
 #include <netinet/udp.h>
 #include <netinet/udp_var.h>
 
+#include <machine/endian.h>
+
 #include "stand.h"
 #include "net.h"
 
@@ -82,12 +84,21 @@ in_cksum(p, len)
 			}
 		} else {
 			while ((len -= 2) >= 0) {
+#if BYTE_ORDER == BIG_ENDIAN
 				sum += *cp++ << 8;
 				sum += *cp++;
+#else
+				sum += *cp++;
+				sum += *cp++ << 8;
+#endif
 			}
 		}
 		if ((oddbyte = len & 1) != 0)
+#if BYTE_ORDER == BIG_ENDIAN
 			v = *cp << 8;
+#else
+			v = *cp;
+#endif
 	}
 	if (oddbyte)
 		sum += v;