[IPV4] MROUTE: Move PIM definitions to <linux/pim.h>.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index 9cdd12a..84736ac 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -289,6 +289,7 @@
 unifdef-y += patchkey.h
 unifdef-y += pci.h
 unifdef-y += personality.h
+unifdef-y += pim.h
 unifdef-y += pktcdvd.h
 unifdef-y += pmu.h
 unifdef-y += poll.h