ipv6: Update ipv6 static library with newly needed functions

UDP offload needs some additional functions to be in the static kernel
for it work correclty.  Move those functions into the core.

Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc net/ipv6/Makefile
Simple merge

diff --cc net/ipv6/exthdrs.c
Simple merge

diff --cc net/ipv6/exthdrs_core.c
Simple merge

diff --cc net/ipv6/ip6_output.c
Simple merge

diff --cc net/ipv6/output_core.c
Simple merge