pkg/37087: pkg_delete should remove empty directories automatically

[rillig%NetBSD.org@localhost]

>Number:         37087
>Category:       pkg
>Synopsis:       pkg_delete should remove empty directories automatically
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    pkg-manager
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Tue Oct 09 10:35:00 +0000 2007
>Originator:     Roland Illig
>Release:        N/A
>Organization:
>Environment:
N/A
>Description:
When removing a package, pkg_delete should remember all directories where files 
have been removed, and at the end try to remove these directories if they are 
empty.

This would make many @dirrm lines in PLIST files superfluous. It would also 
make the *-dirs packages needless, as far as I have understood the concept 
behind them.

Packages that need an empty directory under $PREFIX then need a way to 
explicitly specify this. I expect the number of these packages to be fairly 
small.

>How-To-Repeat:
grep -r ^@dirrm $pkgsrcdir

>Fix: