bootstrap cmake in parallel
bootstrap cmake in parallel

Summary: Lets make this faster

Reviewed By: Croohand

Differential Revision: D32614135

fbshipit-source-id: 2285bdb89c2ad982667261800f327f851a6cfcec

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