Silence warnings in MSVC++: hide unused variables, add constness back to

inet_pton/ntop, convert htons argument to u_short.

Modules/getaddrinfo.c

@@ -343,7 +343,7 @@ getaddrinfo(hostname, servname, hints, res)
 				pai->ai_socktype = SOCK_DGRAM;
 				pai->ai_protocol = IPPROTO_UDP;
 			}
-			port = htons(atoi(servname));
+			port = htons((u_short)atoi(servname));
 		} else {
 			struct servent *sp;
 			char *proto;
@@ -417,7 +417,9 @@ getaddrinfo(hostname, servname, hints, res)
 	for (i = 0; gai_afdl[i].a_af; i++) {
 		if (inet_pton(gai_afdl[i].a_af, hostname, pton)) {
 			u_long v4a;
+#ifdef INET6
 			u_char pfx;
+#endif
 
 			switch (gai_afdl[i].a_af) {
 			case AF_INET:
@@ -492,7 +494,10 @@ get_name(addr, gai_afd, res, numaddr, pai, port0)
 	u_short port = port0 & 0xffff;
 	struct hostent *hp;
 	struct addrinfo *cur;
-	int error = 0, h_error;
+	int error = 0;
+#ifdef INET6
+	int h_error;
+#endif
 	
 #ifdef INET6
 	hp = getipnodebyaddr(addr, gai_afd->a_addrlen, gai_afd->a_af, &h_error);

Modules/getnameinfo.c

@@ -98,7 +98,9 @@ getnameinfo(sa, salen, host, hostlen, serv, servlen, flags)
 	int family, len, i;
 	char *addr, *p;
 	u_long v4a;
+#ifdef INET6
 	u_char pfx;
+#endif
 	int h_error;
 	char numserv[512];
 	char numaddr[512];

Modules/socketmodule.c

@@ -207,8 +207,8 @@ Socket methods:
 #endif /* USE_SSL */
 
 #ifndef HAVE_INET_PTON
-int inet_pton (int af, char *src, void *dst);
-char *inet_ntop(int af, void *src, char *dst, socklen_t size);
+int inet_pton (int af, const char *src, void *dst);
+const char *inet_ntop(int af, const void *src, char *dst, socklen_t size);
 #endif
 
 /* I know this is a bad practice, but it is the easiest... */
@@ -2948,7 +2948,7 @@ init_socket(void)
 /* Simplistic emulation code for inet_pton that only works for IPv4 */
 #ifndef HAVE_INET_PTON
 int 
-inet_pton (int af, char *src, void *dst)
+inet_pton (int af, const char *src, void *dst)
 {
 	if(af == AF_INET){
 		long packed_addr;
@@ -2966,8 +2966,8 @@ inet_pton (int af, char *src, void *dst)
 	return -1;
 }
 
-char *
-inet_ntop(int af, void *src, char *dst, socklen_t size)
+const char *
+inet_ntop(int af, const void *src, char *dst, socklen_t size)
 {
 	if (af == AF_INET) {
 		struct in_addr packed_addr;