polish: remove 'Created by' lines

A big Thank You to the original contributors of these ports:

  *  Aleksander Fafula <alex@BSDGuru.org>
  *  Aleksander Fafula <alex@bsdguru.org>
  *  Jacek Pelka <jacek@combit.com.pl>
  *  Maciek Korzen <eaquer@ceti.pl>
  *  Pawel Pekala <c0rn@o2.pl>
  *  Piotr Smyrak <smyru@heron.pl> and
  *  Thierry Thomas <thierry@pompo.net>
  *  smyru@heron.pl
  *  wtp@bsdguru.org

With hat:	portmgr