Bug#758100: perl: adopt versioned provides

[Niko Tyni <ntyni@debian.org>]

Package: perl
Version: 5.18.2-7
Severity: wishlist
x-debbugs-cc: debian-perl@lists.debian.org

dpkg (1.17.11) unstable; urgency=low
[...]
* Add versioned Provides support:
    - Add a new dpkg --assert-versioned-provides command.
    - Packages can provide a specific version, “virtual (= 1.0)” which will
      be honored, previously it would just be accepted when parsing.
    - Non-versioned virtual packages will not satisfy versioned dependencies.
    - Versioned virtual packages will satisfy non-versioned dependencies.
    Based on skeletal code by Ben Collins <bcollins@debian.org>.
    Closes: #7330, #24934, #112131, #134582, #180316

I expect this will be very useful for us and will put an end to the
mess with 'perl (>= 5.18.0) | libdual-life-module (>= x.x)' dependencies.
AIUI, 'libdual-life-module (>= x.x)' should be enough in the future.

Assuming dpkg in wheezy already accepts the versioned provides when
parsing, I suppose we could put them in the perl package straight away
and start cleaning the dependencies after jessie.
-- 
Niko Tyni   ntyni@debian.org