Debian: The build system is packaged as a part of libucw-dev

Debian: The build system is packaged as a part of libucw-dev

Previously, I added UCW::Configure to libucw-perl, but I forgot
that most users of this module also need the build system. Surprisingly,
our packaging completely avoided the build system files.

Therefore, I moved UCW::Configure to libucw-dev and added the build
system there, too.

In the long term, we should move UCW::Configure under build/.

Since nobody is using v6.5.3 yet, I am rebuilding it with these
changes applied.