.arcconfig

match: delete unused argument "listsubrepos" from _buildmatch()

Seems to have been unused since 9f9ffe5f687c (match: compose 'set:'
pattern as matcher, 2018-06-10).

Differential Revision: https://phab.mercurial-scm.org/D5924

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