message: Fix compile error on PHP low version.
diff: @@ -215,7 +215,7 @@ static sw_inline int http_parse_set_cookies(const char *at, size_t length, zval
  swWarn("cookie key format is wrong.");
  return SW_ERR;
  }
  - add_assoc_stringl_ex(set_cookie_headers, at, klen, at, length);
  + add_assoc_stringl_ex(set_cookie_headers, at, klen, (char *) at, length);
  // val
  p+=1;
  eof = (char*) memchr(p, ';', length);
  