Log message:
lang/python and a number of python packages: re-do atomic64.mk issue.

Evidently, python 3.13 brought in the need to support 64-bit atomics.
This means that python extension packages built with C needs to
use mk/atomic64.mk to make -latomic available on the required 32-bit
ports.  Sadly, there is no reliable way to detect in the .mk files
whether the package is using C (or C++), so this change adds an
unconditional include of mk/atomic64.mk when the python version is
equal to or larger than 3.13 for packages using egg.mk or wheel.mk.

This undoes the individual package Makefile inclusions of mk/atomic64.mk
that I've added over the last few days.

Log message:
security/py-cryptodome: use atomic64.mk to fix build on macppc w/py3.13.

Log message:
py-cryptodome: update to 3.21.0.

3.21.0 (30 September 2024)
++++++++++++++++++++++++++

New features
---------------
* By setting the PYCRYPTODOME_DISABLE_GMP environment variable,
  the GMP library will not be used even if detected.
* Add support for Curve25519 / X25519.
* Add support for Curve448 / X448.
* Add attribute ``curve`` to EccPoint and EccXPoint classes,
  with the canonical name of the curve.
* GH#781: the label for the SP800_108_Counter KDF may now
  contain zero bytes. Thanks to Julien Rische.
* GH#814: RSA keys for PSS can be imported.

Resolved issues
---------------
* GH#810: fixed negation of Ed25519 points.
* GH#819: accept an RFC5916 ECPrivateKey even if it doesn't
  contain any of the optional elements
  (parameters [0] and publicKey[1]).

Other changes
-------------
* Remove support for Python 3.5.

Log message:
python: remove Python 2.7 from the default build set

Set PYTHON_27_ACCEPTED for packages where 2.7 needs to be supported
because other 2.7 packages depend on it, but it also supports 3.x.

Tested by jperkin, thanks!

Log message:
py-cryptodome: updated to 3.20.0

3.20.0 (9 January 2024)

New features
---------------
* Added support for TurboSHAKE128 and TurboSHAKE256.
* Added method ``Crypto.Hash.new()`` to generate a hash
  object given a hash name.
* Added support for AES-GCM encryption of PBES2 and PKCS#8
  containers.
* Added support for SHA-2 and SHA-3 algorithms in PBKDF2
  when creating PBES2 and PKCS#8 containers.
* Export of RSA keys accepts the ``prot_params`` dictionary
  as parameter to control the number of iterations for PBKDF2
  and scrypt.
* C unit tests also run on non-x86 architectures.

Resolved issues
---------------
* Fixed autodetect logic for GCC 14 in combination with LTO.

Log message:
py-cryptodome: updated to 3.19.1

3.19.1 (28 December 2023)

Resolved issues
* Fixed a side-channel leakage with OAEP decryption that could be
  exploited to carry out a Manger attack. Thanks to Hubert Kario.

Log message:
py-cryptodome: updated to 3.19.0

3.19.0 (16 September 2023)

New features
---------------
* The ``update()`` methods of TupleHash128 and TupleHash256 objects
  can now hash multiple items (byte strings) at once.
  Thanks to Sylvain Pelissier.
* Added support for ECDH, with ``Crypto.Protocol.DH``.

Resolved issues
---------------
* GH754: due to a bug in ``cffi``, do not use it on Windows with Python 3.12+.

Log message:
*: Use FORCE_C_STD=c99 for C packages that use for loop initial
declarations without setting -std=c99.