[issue185] Add -D to install

["Simon 'corecode' Schubert \(via DragonFly issue tracker\)" <sinknull@xxxxxxxxxxxxxxxxxxxxxxx>]

Simon 'corecode' Schubert <corecode@fs.ei.tum.de> added the comment:

a cursory look only showed GNU supporting -D.  netbsd uses it for something
different, other OS don't use it at all.  I think we shouldn't commit it. 
closing for now unless anybody feels we need to have it.

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status: chatting -> resolved

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