Remove flex from thrift dependencies
Remove flex from thrift dependencies

Summary: Thrift no longer depends on flex. Update the fbcode builder manifest accordingly.

Reviewed By: thedavekwon

Differential Revision: D35907980

fbshipit-source-id: c5f23542967339c1dadb805ad11816a2982fe4f7

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