packaging: add pygit2 to the py3 Windows installers
This is needed to be able to use the git extension.
The extension no longer complains about the library being not installed, but
`hg log -r .` on a repo that works in WSL yielded a TypeError:
...
File "mercurial.hg", line 188, in _peerorrepo
File "mercurial.localrepo", line 3224, in instance
File "mercurial.localrepo", line 623, in makelocalrepository
File "hgext.git", line 117, in _makestore
File "hgext.git", line 48, in __init__
TypeError: Repository unable to unpack backend.
Differential Revision: https://phab.mercurial-scm.org/D9405
copyright (c) 2006-2010 David JEAN LOUIS
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.