message: fix: the symbol CURL_PROGRESSFUNC_CONTINUE is only available with libcurl >= 7.68.0
diff: @@ -881,7 +881,11 @@ int Easy::CbProgress(void* clientp, double dltotal, double dlnow, double ultotal
  returnValue = Nan::To<int32_t>(returnValueCallback.ToLocalChecked()).FromJust();
  }
  +#if NODE_LIBCURL_VER_GE(7, 68, 0)
  if (returnValue && returnValue != CURL_PROGRESSFUNC_CONTINUE) {
  +#else
  + if (returnValue) {
  +#endif
  obj->isCbProgressAlreadyAborted = true;
  }
  @@ -1027,7 +1031,11 @@ int Easy::CbXferinfo(void* clientp, curl_off_t dltotal, curl_off_t dlnow, curl_o
  returnValue = Nan::To<int32_t>(returnValueCallback.ToLocalChecked()).FromJust();
  }
  +#if NODE_LIBCURL_VER_GE(7, 68, 0)
  if (returnValue && returnValue != CURL_PROGRESSFUNC_CONTINUE) {
  +#else
  + if (returnValue) {
  +#endif
  obj->isCbProgressAlreadyAborted = true;
  }
  