pcr: remove cglib
The cglib project has the following in its README.md:
IMPORTANT NOTE: cglib is unmaintained and does not work well (or
possibly at all?) in newer JDKs, particularly JDK17+. If you need
to support newer JDKs, we will accept well-tested well-thought-out
patches... but you'll probably have better luck migrating to
something like ByteBuddy.
Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>