Patch to add package-smart target

[Adam Martin]

Hello,

	I wasn't sure who to send this to, but Benno Rice suggested ports@  
and kris@, so I've done both.  I've created a patch for a target that  
I've added to bsd.ports.mk (in /usr/ports/Mk/) a while back, to fix  
what I consider a "problem" in package-recursive.  package-recursive  
always re-builds a tarball for every package in the dependancy chain,  
even if said tarball exists.  package-smart will skip that step for  
all tarballs that already exist.  (It's not perfect, but I thought  
somebody should look at it, and see what they can do with it.)

	The patch is attached.

Regards,

--
ADAM David Alan Martin

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