Issue #19600: Use specific asserts in distutils tests.

diff --cc Lib/distutils/tests/test_archive_util.py
Simple merge

diff --cc Lib/distutils/tests/test_config.py
Simple merge

diff --cc Lib/distutils/tests/test_install.py
Simple merge

diff --cc Lib/distutils/tests/test_install_lib.py
Simple merge

diff --cc Lib/distutils/tests/test_util.py
Simple merge