maintainer-feedback requested: [Bug 250884] math/cantor: Support ptyhon3.9 instead of duplicating python 3.6 check

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Bugzilla Automation <bugzilla at FreeBSD.org> has asked freebsd-kde (Team)
<kde at FreeBSD.org> for maintainer-feedback:
Bug 250884: math/cantor: Support ptyhon3.9 instead of duplicating python 3.6
check
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250884



--- Description ---
Cantor upstream is checking for python3.6 itself now, however it is missing
python3.9 check. So if DEFAULT_VERSIONS+=python3=3.9 is set and earlier version
of python is not installed math/cantor fails to detect python. Then it fails to
install because of missing files listed in pkg-plist.

In the proposed patch REINPLACE_CMD args are ajusted to add python3.9 support
(and stop duplicating python3.6 entry)