Fix compilation error when FEATURE_FANCY_PING enabled.  Also
reorder networking/Config.in moving FEATURE_FANCY_PING next to
PING6.  (Cristian Ionescu-Idbohrn)

diff --git a/networking/ping.c b/networking/ping.c
index 382389d..11138c0 100644
--- a/networking/ping.c
+++ b/networking/ping.c
@@ -94,7 +94,7 @@
 	char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
 
 	pingsock = create_icmp_socket();
-	pingaddr = lsa->sin;
+	pingaddr = lsa->u.sin;
 
 	pkt = (struct icmp *) packet;
 	memset(pkt, 0, sizeof(packet));
@@ -138,7 +138,7 @@
 	char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
 
 	pingsock = create_icmp6_socket();
-	pingaddr = lsa->sin6;
+	pingaddr = lsa->u.sin6;
 
 	pkt = (struct icmp6_hdr *) packet;
 	memset(pkt, 0, sizeof(packet));