rust-status: remove dead code...
rust-status: remove dead code
The `walk_explicit` function is only called when using a prefix matcher, which
the Rust code does not yet support. This function will return in a future
patch, probably with a different signature for performance reasons.
With it, the `files` argument and its interface code can be removed for now.
Differential Revision:
https://phab.mercurial-scm.org/D7253