message: use new name for OpenVKL ispc driver
  [ci skip]
diff: @@ -186,7 +186,7 @@ namespace ospray {
  }
  vklLoadModule("ispc_driver");
  - VKLDriver driver = vklNewDriver("ispc_driver");
  + VKLDriver driver = vklNewDriver("ispc");
  vklCommitDriver(driver);
  vklSetCurrentDriver(driver);
  }
  