Remove add-ons mechanism

[Florian Weimer]

On 10/05/2017 12:39 PM, Andreas K. Huettel wrote:
> Am Donnerstag, 28. September 2017, 19:49:28 CEST schrieb Joseph Myers:
>> glibc has an add-ons mechanism to allow additional software to be
>> integrated into the glibc build.
> [...]
>> libidn used to have separate release tarballs
>> but no longer does so, but still uses the add-ons mechanism within the
>> glibc source tree.
> 
> http://git.savannah.gnu.org/gitweb/?p=libidn.git;a=shortlog
> 
> Doesn't look dead to me; actually the libidn inside glibc looks way outdated
> (before 2012 I think).

Joseph means glibc-libidn-2.3.4.tar.bz2 etc. available here:

   <https://ftp.gnu.org/pub/gnu/glibc/>

Their packaging is completely different from the libidn upstream releases.

Thanks,
Florian