hfst-3.12.2-bp152.3.18

- Add gcc7.diff

- Update to new upstream release 3.12.2
  * Implement hfst-twolc as a single program instead of a script. Get
  rid of hfst-twolc-system and hfst-twolc-loc tools.
- Remove hfst-badcode.diff (applied upstream)

- Initial package for build.opensuse.org (version 3.7.2)