cmake: build edenfsctl Rust
cmake: build edenfsctl Rust

Summary: This diff adds the Rust edenfsctl to our open source build.

Reviewed By: xavierd

Differential Revision: D30788685

fbshipit-source-id: 603caa933ecfc5af0ede7e22f6c7911462da3a65

facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro