[bug-mailutils] Dependency on List::Regexp

[Jean Louis]

Hello,

I have updated latest git version of the ultimately usable
GNU Mailutils software.

And I have noticed that it depends now on a Perl module List::Regexp
-- as I am heavy user, and I do not change my system, I know that this
was not the case before.

As a suggestion, such check for existence of the module shall be maybe
in ./configure script.

Jean