As per https://peps.python.org/pep-0394/, the python binary can be one
of the following options:
- Python 2
- Python 3
- Not exist
All of the scripts in libxml2 use 'python', which may not exist.
As Python 2 reached EOL on the 1st January 2020, it's safe to move the
scripts to use python3 explicitly.
* xmlschemas.c include/libxml/xmlschemas.h python/generator.py
python/libxml.c python/libxml_wrap.h python/types.c
python/tests/schema.py python/tests/Makefile.am: Applied patch
from Torkel Lyng to add Schemas support to the Python bindings
and extend the schemas error API, registered a new test.
* doc/* elfgcchack.h: rebuilt to regenerate the bindings
Daniel