miniupnpd: Enable PCP by default.
miniupnpd: Work in IPv6 on system where PF_INET6 are restricted to IPv6 only
miniupnpd: reduce number of global variables by using more runtime_flags

change ipv6_enabled/ipv6fc_inbound_pinhole_allowed/ipv6fc_firewall_enabled
global vars to flags in runtime_flags
catch up Changelog.txt

see commit 3ed34783981881856b14dcd3e98246495dc6e419
miniupnpd: fix BSD Makefile
miniupnpd: change IP change msg from LOG_DEBUG to LOG_INFO