Special-case CTL_ALIAS instead of CTL_DNS in udp loopback test.

At the same time remove a bogus test (tested by Jason Wessel).
Quiet some gcc4 warnings from slirp compilation.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4402 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/slirp/misc.c b/slirp/misc.c
index 14808fe..337f8a8 100644
--- a/slirp/misc.c
+++ b/slirp/misc.c
@@ -304,7 +304,7 @@
 {
 	int s;
 	struct sockaddr_in addr;
-	int addrlen = sizeof(addr);
+	socklen_t addrlen = sizeof(addr);
 	int opt;
         int master = -1;
 	char *argv[256];