supporting workspace?

[dovahcrow]

It seems like this crate does not work if it is used in a workspace. The error is:

thread 'main' panicked at 'Failed to acquire build-time information: Os { code: 2, kind: NotFound, message: "No such file or directory" }'

By a little bit of investigation, I think the culprit is get_build_deps, where it errored out when trying to open the lockfile.