Fix pfroute IPv6 code

Fix pfroute IPv6 code

Quoting Joe Marcus Clarke:

	"There are two problems in the iface-pfroute.c IPv6 detection
	code. The first is that the KAME stack embeds a scope ID into
	IPv6 addresses. This can cause certain hosts not to be able to
	recognize the address. The second is that global_scope is always
	set to 1 even for link-local addresses.

	The attached patch fixes both problems. The KAME fix was
	submitted by Hajimu UMEMOTO."

Patch from Joe Marcus Clarke/Hajimu UMEMOTO.