port reclaim exclude build dependencies

[Jonathan Stickel]

The `reclaim` command of port is a great idea. However, it has a serious 
limitation, at least for me. When checking for leaves, it does not 
consider build dependencies, which I like to keep (rather than 
reinstalling every time they are needed). Therefore I cannot let it 
uninstall leaves. Fortunately, I can still use port_cutleaves for this 
purpose, using the `-b` option. As far as I can tell, such an option 
does not exist for port reclaim. Is there sufficient interest to 
(re-)open a ticket requesting this feature? I found this one that is 
basically the same as what I am requesting:

https://trac.macports.org/ticket/57180

It was closed with `worksforme`, suggesting that the submitter should 
use `setrequested` for his build dependencies. I would rather not do 
that because build dependencies can change as ports evolve.

Thanks,
Jonathan