Fix OSS build
Fix OSS build

Summary: Forgot to update `CMakeLists.txt` in D33668386 (https://github.com/facebook/fbthrift/commit/c269e3e67c914d888fa3bbb52b622f8fc2bca944)

Reviewed By: vitaut

Differential Revision: D33808305

fbshipit-source-id: 0f38fa589f7b5c5650fc0c72dd7721722c022c8e

facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift