match: avoid rust fast path if the matcher was tampered with Otherwise the fast path does not respect the modifications made by the extension (concretely largefiles, but other extensions can start using that too)

{
    "conduit_uri": "https://phab.mercurial-scm.org/api",
    "phabricator.uri": "https://phab.mercurial-scm.org/",
    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
}