rev-upgrade to determine if binary is distributable

[Clemens Lang]

On Wed, Jun 06, 2012 at 04:23:50PM -0700, Bradley Giesbrecht wrote:
> Yep. Rev-upgrade triggered the idea get port licenses based on linked
> files rather then port deps. The distributable script is a better
> place to perform the test.

Also when writing this, it's probably simple to check whether any
libraries are linked from a port without declaring a dependency.

-- 
Clemens Lang