message: set VKL error/log message callbacks to go through OSPRay
diff: @@ -211,6 +211,13 @@ namespace ospray {
  break;
  }
  + vklDriverSetErrorFunc(driver, [](VKLError, const char *message) {
  + handleError(OSP_UNKNOWN_ERROR, message);
  + });
  +
  + vklDriverSetLogFunc(
  + driver, [](const char *message) { postStatusMsg() << message; });
  +
  vklCommitDriver(driver);
  vklSetCurrentDriver(driver);
  }
  