This will need some testing, it works here when I test it but god knows if I
didn't miss something.

- Version update to 1.22.4:
* Many fixes for hyphenation helping
* Various build tweaks
* See the NEWS file for details
- New signature -> update keyring file
- Remove upstream merged patches:
* groff-multi-thread.patch
* groff-reproducible-mdate.patch
* groff-use-SDE.patch
- Remove groff-1.21-groffer-libexecdir.patch as upstream redid
the autotools rules and uses configure option now
- Rebase patch groff-1.20.1-deunicode.patch
- Rebase patch groff-1.21-CVE-2009-5081.patch
- Drop patch groff-1.21-CVE-2009-5080.patch as it seems the shell
script now properly safeguards against this
- Rebase patch 0002-documentation-for-the-locale-keyword.patch
- Recreate groff-force-locale-usage.patch for autotools buildsystem
- Add patch 0004-don-t-use-usr-bin-env-in-shebang.patch
- Remove groff_1.22.3-1.debian.diff and replace it with split
debian patches:
* bash-scripts.patch
* sort-perl-hash-keys.patch

- Switch to multibuild in order to avoid having to manage 2
differentiating spec files

- Remove not really needed patch groff-1.20.1-destbufferoverflow.patch