break dependency on folly:format
break dependency on folly:format

Summary: folly:format is deprecated and was dead in this situation anyway.

Differential Revision: D31025771

fbshipit-source-id: 8256cc108510f49934cae0537a70c5c74ff99390

facebook/watchman,facebook/watchman,nodakai/watchman,nodakai/watchman,facebook/watchman,facebook/watchman,facebook/watchman,nodakai/watchman,facebook/watchman,nodakai/watchman,nodakai/watchman,facebook/watchman,facebook/watchman,nodakai/watchman,nodakai/watchman,nodakai/watchman,facebook/watchman,nodakai/watchman