setup: copy python3.dll next to hg.exe when building on Windows for hgext.git
I thought I took care of this already, but it must have been that I just
manually copied the file over locally when debugging why the pygit2 library
wasn't loading. The problem with that is what was copied over was from py38,
and then running a py39 build hard crashed when the extension was loaded.
Differential Revision: https://phab.mercurial-scm.org/D10301
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"phabricator.uri": "https://phab.mercurial-scm.org/",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}