Bug#848337: dh-make-perl: Require user intervention to resolve version ambiguity

[Christopher Hoskin]

Package: dh-make-perl
Version: 0.92
Severity: normal
Tags: patch

Dear Maintainer,

Upstream developers sometimes upload Perl modules to CPAN, forgetting to update
the version in the META, Build or Makefile. In these situations, dh-make-perl 
ignores the CPAN version and trusts the META.yml version, without making the 
packager aware of the discrepancy. Examples of upstream modules where this has
happened are Cache::Memcached::libmemcached and Catalyst::View::CSV.

The attached patch causes dh-make-perl to quit if the module version does not
match the CPAN version, and requires the user to explicity specify the version
with --version.

This reduces the likelihood of the packager uploading a package with a version
number which does not correspond to the actual upstream version.

Thanks.

Christopher Hoskin
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