Bug#513739: /var/cache/pbuilder not empty so not removed upon purge

[jidanni at jidanni.org]

Package: pbuilder
Version: 0.185

Purging configuration files for pbuilder ...
dpkg - warning: while removing pbuilder, directory `/var/cache/pbuilder' not empty so not remo
# rm -rv /var/cache/pbuilder
rm: remove directory `/var/cache/pbuilder/build'? y