.arcconfig

py3: wrap tempfile.NamedTemporaryFile() to return bytes fp.name

Unlike its name, tempfile.NamedTemporaryFile is not a class, so I renamed
the pycompat version to look like a plain function.

Since temp.name uses in the infinitepush extension aren't bytes-safe, this
patch leaves them unmodified. Another weird thing is tempfile.mktemp(),
which does not accept bytes suffix nor prefix. Sigh.

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    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
}