Fix unsigned char mismatch

Author: nikic

ext/standard/php_dns.h

@@ -23,7 +23,7 @@
 
 #if defined(HAVE_DNS_SEARCH)
 #define php_dns_search(res, dname, class, type, answer, anslen) \
-    	((int)dns_search(res, dname, class, type, answer, anslen, (struct sockaddr *)&from, &fromsize))
+    	((int)dns_search(res, dname, class, type, (char *) answer, anslen, (struct sockaddr *)&from, &fromsize))
 #define php_dns_free_handle(res) \
 		dns_free(res)