.arcconfig

make: add new directory 'hgdemandimport' to cleanbutpackages rule

This fixes the build process for ppa (at least in my simple check).
Perhaps we should loop through all directory that aren't 'packages'?

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