Add various defines/macros required by IGMPv3:  * MCAST_UNDEFINED state.  * in_allhosts() macro (group is 224.0.0.1).    This uses a const endian comparison.  * IP_MAX_GROUP_SRC_FILTER, IP_MAX_SOCK_SRC_FILTER    default resource limits.
Add various defines/macros required by IGMPv3:
 * MCAST_UNDEFINED state.
 * in_allhosts() macro (group is 224.0.0.1).
   This uses a const endian comparison.
 * IP_MAX_GROUP_SRC_FILTER, IP_MAX_SOCK_SRC_FILTER
   default resource limits.

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