dirstatemap: use a common implementation for `dirstatemap.set_untracked`
We can now make sure they use the same code, and drop the older, out of sync,
implementation of `set_untracked` for the rust wrapper.
Differential Revision: https://phab.mercurial-scm.org/D11572
{
"version": 1,
"project": "mercurial",
"project_url": "https://mercurial-scm.org/",
"repo": "..",
"branches": ["default", "stable"],
"environment_type": "virtualenv",
"show_commit_url": "https://www.mercurial-scm.org/repo/hg/rev/",
"benchmark_dir": "benchmarks",
"env_dir": "../.asv/env",
"results_dir": "../.asv/results",
"html_dir": "../.asv/html"
}