rcsparse python3 support patches from OpenBSD ports

https://cvsweb.openbsd.org/cgi-bin/cvsweb/ports/devel/py-rcsparse/patches/
$OpenBSD: patch-py-rcsparse_c,v 1.4 2021/02/18 03:35:07 yasuoka Exp $
$OpenBSD: patch-testmodule_py,v 1.2 2021/02/18 03:35:07 yasuoka Exp $