There doesn't seem to be any particular need to do this.

Also remove unused uuid variable.

Instead of generating the list of message ids anew during every build,
the file is generated manually and committed into the
repository. Also, the list of defines is stored in id128-defines.h,
also kept in the repository. Both files should only grow.

This should make build easier. But it also fixes a problem with
systemd, which occasionally drops message definitions. We will keep
them forever, so it should be safe to rely on the presence of message
definitions which systemd does not use anymore.

Fixes #23.

The license was originally MIT, but when this module became part of systemd,
it was changed to LGPLv2+. All files had correct headers, so only the LICENSE
file needs updating. Take the opportunity to add classifiers to setup.py.

In practice this shouldn't make much difference, but
sometimes our headers might be newer, and we want to
test them.