devel/libffi: Bump deps PORTREVISION for shlib change

PR:		263764
Reported by:	VVD <vvd@unislabs.com>

lang/tauthon: remove past expiration date.

Keep this port deprecated, as it is a Python 2.7+3.X clone.
Nothing in the tree currently uses this port, but www/palemoon will
if it is ever resurrected.

lang/tauthon: Update to 2.8.3

ChangeLog:
https://github.com/naftaliharris/tauthon/blob/master/Misc/NEWS.d/2.8.3.rst

PR:	256387
Reported by:	olivier.freebsd@free.fr (maintainer)
Security:	CVE-2020-8492
MFH:	2021Q2

Mk: switch from PYTHON_PORTVERSION to PYTHON_DISTVERSION

This brings python framework in consistense with handbook recommendations
to prefer DISTVERSION and simplifies adding prerelease versions of
python

PR:		255013
Differential Revision:	https://reviews.freebsd.org/D29418
Exp-run by:	antoine
Approved by:	wen@, no objection from python@ or portmgr@

*: Remove unnecessary 'port' argument from USES=readline

PR:		248459
Exp-run by:	antoine

One more small cleanup, forgotten yesterday.
Reported by:	lwhsu

Remove # $FreeBSD$ from Makefiles.

Regular USE_GITHUB cleanup.

Remove DISTNAME, it is always overwritten.
Cleanup GH_TAGNAME and WRKSRC.

Resurrect tauthon and give it a proper expiration notice

Remove some ports that were created despite the expirations in place

[NEW] lang/tauthon: Backwards-compatible fork of Python 2.7 interpreter with
Python 3.x features

------------------------------------------------------------------------------
Note this is not fully connected yet, and needs further changes to integrate
with flavors, addition to Mk/Uses/python.mk (or some equivalent USES=tauthon)
that may need discussion first, for instance, on the package name prefix.

This is committed to serve as a common test bed and for experimentation.
------------------------------------------------------------------------------

Maintainer:	olce.freebsd.ports@certner.fr (Olivier Certner)

Tauthon is a backward-compatible fork of Python's 2.7.18 interpreter with new
syntax, builtins, and libraries backported from Python 3.x.