Fix phpGH-20554: php_cli_server() get http status as string build issue.

due to the signature of this helper it needs to be const also
bsearch key argument needs to be too.

close phpGH-20556

Author: devnexen

sapi/cli/php_cli_server.c

@@ -304,7 +304,7 @@ static int status_comp(const void *a, const void *b) /* {{{ */
 
 static const char *get_status_string(int code) /* {{{ */
 {
-	http_response_status_code_pair needle = {code, NULL},
+	const http_response_status_code_pair needle = {code, NULL},
 		*result = NULL;
 
 	result = bsearch(&needle, http_status_map, http_status_map_len, sizeof(needle), status_comp);