Bird 2.0.0 and (filter) code deduplication

[Clemens Schrimpe]

> You can use ‘net.type = NET_IP4', 'net.type = NET_IP6'.

Nice …

And you can also „just“ mix IPv6 and legacy IPv4 matches in prefix-lists, etc.:

	if net ~ [
		2001:db8::/32+,			# doc

		fc00::/15+,         		# ULAs
		fe80::/16+          		# link locals

 		192.168.0.0/16+,		# RFC1918
 		172.16.0.0/24+,			# RFC1918
 		10.0.0.0/8+,			# RFC1918
	] then {


Works just fine with 2.0.0 …

	-c