Revert "dns cache per interface iteration 2"

This reverts commit f1464ff956

Change-Id: I3496b9a8cb54614fe3eea016d1391c8a89f3db38

libc/netbsd/resolv/res_data.c

@@ -82,7 +82,13 @@ extern struct __res_state _nres;
 
 int  res_ourserver_p(const res_state, const struct sockaddr *);
 
+#ifdef ANDROID_CHANGES
+static int res_need_init() {
+	return ((_nres.options & RES_INIT) == 0U) || res_get_dns_changed();
+}
+#else
 #define res_need_init()   ((_nres.options & RES_INIT) == 0U)
+#endif
 
 int
 res_init(void) {