net-firewall/shorewall*: v4.5.21.5 added

Changelog
=========
1)  A number of minor updates have been made to the documentation and
    manpages.

2)  The 'postcompile' extension script is now documented at
    http://www.shorewall.org/shorewall_extension_scripts.htm

3)  The 'add' command previously failed if 'IPSET=' appeared in the
    shorewall.conf file. This has been corrected.

Full changelogs: http://www1.shorewall.net/pub/shorewall/4.5/shorewall-4.5.21/releasenotes.txt

Gentoo-specific changes
=======================
Added minimum versions on dependency atoms, see [1] for more information.
Because upstream doesn't really specify a minimum version for packages
like dev-perl/Socket6 or sys-devel/bc, a recent stable
version was chosen.

[1] http://thread.gmane.org/gmane.linux.gentoo.devel/88762