libxt_recent: restore reap functionality to recent module

The reap functionality appears to have been accidentally disabled
by (74ded72 libxt_recent: add --mask netmask) since iptables 1.4.15
and later.  This adds a patch to restore reap functionality for
recent_opts_v1.

Patch obtained via: http://patchwork.openwrt.org/patch/3812/

Signed-off-by: Russell Senior <russell@personaltelco.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>