jgoodies-forms-1.3.0-bp150.2.3

- Fix build with jdk9: specify java source and target 1.6
- Clean spec file and fix duplicate waste rpmlint error

- Drop update-alternatives code that is not needed.

- Update to version 1.3.0:
  + Read /usr/share/doc/packages/jgoodies-forms/RELEASE-NOTES.txt
    for list of changes since previously packaged version
  + Introduces BuildRequires on unzip
- Cleanup spec file
  + License tag in compliance with spdx.org norms
  + Remove list of authors from description and package the same
    in an AUTHORS text file
  + Remove empty %clean section.

- Initial packaging (based on Packman source rpm)