John Baldwin c23de1f45b Defer the work of freeing IPv4 multicast options from a socket to an
asychronous task.  This avoids tearing down multicast state including
sending IGMP leave messages and reprogramming MAC filters while holding
the per-protocol global pcbinfo lock that is used in the receive path of
packet processing.

Reviewed by:	rwatson
MFC after:	1 month
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