`distutils.log` is deprecated. See
https://setuptools.pypa.io/en/latest/deprecated/distutils-legacy.html

Signed-off-by: Benjamin Drung <benjamin.drung@canonical.com>

Commit 90046b7 introduced the check for
DistUtilsExtra >= 2.24 in 2011. Since `distutils.version` is deprecated,
drop this version check.

Signed-off-by: Benjamin Drung <benjamin.drung@canonical.com>

A future commit will port build_java to a custom setuptools module which
should not be installed. To avoid installing such modules, explicitly
list all packages that should be installed.

Signed-off-by: Benjamin Drung <benjamin.drung@canonical.com>

Using distutils directly is deprecated. Port `build_java_subdir` and the
installation of the Java files to a setuptools plugin.

packages needs to be specified for the `setup` call to avoid installing
`setuptools_apport`.

Signed-off-by: Benjamin Drung <benjamin.drung@canonical.com>