.arcconfig

diffhelpers: be more tolerant for stripped empty lines of CRLF ending

Exchange. It appears to trim lines containing only whitespace as well as
converting LF to CRLF.

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