Changing the default .zoo extractor

[Jonathan Schleifer <js%pkgsrc.org@localhost>]

Hi!

We have a few distfiles that need archives/zoo to unpack. However, 
archivers/zoo is dead upstream and has known exploitable bugs.

I have written my own implementation of Zoo as part of devel/objfw, 
which also comes with a command line util called ofarc using said 
implementation. I'd like to propose to switch the extractor for .zoo 
files over to devel/objfw. The downside is that devel/objfw has a 
dependency on clang right now, albeit being technically possible to 
build with GCC (with a reduced feature set, which breaks software out 
there needing those features - but we could add a separate "objfw-gcc" 
package or something that would have a fully working ofarc).

While at it, we could also switch over .lha to devel/objfw if we want 
to, as the current lha doesn't seem much maintained either and has a 
weird license that is only available in Japanese.

Thoughts?

--
Jonathan