ipv6: Move <linux/in6.h> from header-y to unifdef-y.

Given that <linux/in6.h> contains a __KERNEL__ test, it should be
unifdef-ed.

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index b7d81b2..54a4cfb 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -92,7 +92,6 @@
 header-y += if_strip.h
 header-y += if_tun.h
 header-y += if_tunnel.h
-header-y += in6.h
 header-y += in_route.h
 header-y += ioctl.h
 header-y += ip6_tunnel.h
@@ -236,6 +235,7 @@
 unifdef-y += igmp.h
 unifdef-y += inet_diag.h
 unifdef-y += in.h
+unifdef-y += in6.h
 unifdef-y += inotify.h
 unifdef-y += input.h
 unifdef-y += ip.h