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.
* libxml.spec.in: keep the ChangeLog compressed
* xmlreader.c: fix a segfault when using Close()
* python/tests/Makefile.am python/tests/reader8.py: test for
the Close() reader API.
Daniel