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add IP_ADD/DROP_SOURCE_MEMBERSHIP sockopt
Socket options IP_ADD_SOURCE_MEMBERSHIP / IP_DROP_SOURCE_MEMBERSHIP is used to manage source-specific multicast group; related constant and struct is defined in libc crate, but not in nix.
CHANGELOG and test added, but there are some build error in CI, seems not related to change.
@xgzeng you'll have to rebase to fix the CI failures. It looks like Github won't let me use the merge queue until you do that.
ping @xgzeng can you please rebase the PR?