No way to specify custom target specifications relative to project

[joepie91]

Since rls.toml was deprecated, the only way to specify a custom target in rls-vscode seems to be to configure the rust.target option in the workspace-specific configuration; unfortunately, it seems that relative paths are not supported here, or at least not seen as relative to the project (possibly related to #448?).

As it stands, it seems to only accept 1) rustc-provided target triples, and 2) absolute paths to custom target specifications. The former is obviously not an option for custom target specifications, and the latter isn't very portable; absolute paths are system-specific, so it would be essentially impossible to collaborate on a project with multiple people.

Perhaps this could be fixed in a similar manner to #448, by treating relative target paths as being relative to the project directory?

[Xanewok]

#448 is solved now, could you see if the relative paths work now?