* m4/python.m4: Add python3.12 and 3.11 as valid interpreters, remove
EOL 3.4, 3.5, 3.7 (keep 3.6 because some distributions still ship and
maintain it).
* lang/python/Makefile.am (clean-local): Remove dist and gpg.egg-info
created by Python 3.9+ on make install.
* lang/python/setup.py.in: switch from distutils to setuptools where
possible, remove obsolete and deprecated -py3 option of swig, add
classifiers up to 3.12, remove 3.4, 3.5, 3.7.
* lang/python/doc/src/gpgme-python-howto.org: replace distutils with
setuptools
* lang/python/examples/howto/advanced/cython/setup.py: replace distutils
with setuptools
--
This fixes building the Python bindings for Python 3.12 where distutils
has been removed.
Based on D545
* Sanitized the shell command examples of extraneous whitespace.
* Removed keycount.c as sanitising it is pointless and it will be
generated by Cython when the example is followed.
* Regenerated the .texi version.
* Added new advanced section with an example of using the Python
bindings with CPython code compiled back to C code using Cython.
* Though it may seem a bit counter-intuitive to use the bindings just
to go back to C via a different route, this is not actually stupid.
* Added examples/howto/advanced/cython/ directory.
* Added keycount.pyx, setup.py and the keycount.c file which the first
two generated with Cython. Not including the .so and .o files from
the build.
* Exported the .texi version of the howto for the main docs.
