pyoxidizer: make sure defaultrc directory exists before trying to write to it
When doing some work involving one-file binaries, this line is failing
for me. It seems reasonable to just make sure the destination
directory exists before splatting the file into it.
Differential Revision: https://phab.mercurial-scm.org/D9401
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"phabricator.uri": "https://phab.mercurial-scm.org/",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}