Add support for drill tool to check_dig (#1218)

[waja]

The patch over there in freebsd seems https://github.com/freebsd/freebsd-ports/blob/master/net-mgmt/nagios-plugins/files/extra-patch-dig-to-drill.diff

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Reply to this email directly or view it on GitHub:
https://github.com/monitoring-plugins/monitoring-plugins/pull/1218#issuecomment-33108874
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