A new function has been created, xbps_remove_pkg_files() that accepts
a dictionary internalized from files.plist and a key to remove
links, dirs, files and conf_files.
As result of this, now when purging a package those directories that
were used in configuration files will also be removed if they are empty.
Bump XBPS_RELVER to 20091207.
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extra : convert_revision : xtraeme%40gmail.com-20091207053006-egw65u6y1jcuraje
972af411d1