patch: unify check_binary and binary flags
Follows up 079b27b5a869. If opts.text=True, check_binary is ignored, so we
can just pass the binary flag to unidiff().
perfunidiff now takes any inputs as text files, which I think is a desired
behavior.
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}