Bug#693903: lintian: Emit error on package with different SOVERSIONs in libraries

[Guillem Jover <guillem@debian.org>]

Package: lintian
Version: 2.5.10.2
Severity: wishlist

Hi!

When a package ships multiple shared libraries (usually a bad idea),
it's okish as long as they use the same SOVERSION. In case they
have different SOVERSIONs and as such are out of step, there's no
guarantee they will not be changed in the future too, in which case
the package would need its name to be bumped, but only due to part
of the contents, some packages might need to be unneedingly rebuilt,
or what's more common, the package will end up not being renamed,
and ABI issues will crop up.

Please add a new check to emit an error in case there's several
shared libraries with different SOVERSIONs. This should also avoid
false positives on stuff like glib.

Thanks,
Guillem