- Update to 0.20
- Add LICENSE (Artistic 1 & GPL 1)

Changes:	http://search.cpan.org/dist/namespace-autoclean/Changes
- Fix build when PREFIX != PKG_PREFIX

PR:		193358
Submitted by:	dinox@
Let USES=libtool also delete links to .la files (and links to links to...)

Approved by:	portmgr (antoine)