Option -d not listed in "mutt -h" output

[Vincent Lefevre <vincent@xxxxxxxxxx>]

"mutt -h" does not list the -d option. It should do it, at least
when debugging has been enabled.

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Vincent Lefèvre <vincent@xxxxxxxxxx> - Web: <http://www.vinc17.org/>
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Work: CR INRIA - computer arithmetic / SPACES project at LORIA