[nagios-plugins] check_mailq: adding nullmailer support (#1189)

Just turning attached patch of github issue #840 into a push request.
(Closes #840)
You can merge this Pull Request by running:

  git pull https://github.com/waja/nagios-plugins github740

Or you can view, comment on it, or merge it online at:

  https://github.com/nagios-plugins/nagios-plugins/pull/1189

-- Commit Summary --

  * check_mailq: adding nullmailer support

-- File Changes --

    M THANKS.in (1)
    M plugins-scripts/check_mailq.pl (43)

-- Patch Links --

https://github.com/nagios-plugins/nagios-plugins/pull/1189.patch
https://github.com/nagios-plugins/nagios-plugins/pull/1189.diff

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