Prepare for handling pkg state with files. So it requires having the
path defined before declaring targets. In addition, it cleans up the
old git-download target.
The 'BSD 3-Clause "New" or "Revised" License' is the value found by
github
3a248f649a/LICENSE
> A permissive license similar to the BSD 2-Clause License, but with a 3rd
> clause that prohibits others from using the name of the project or its
> contributors to promote derived products without written consent.
