Commits on Mar 26, 2021

1. unix: Fix feature(unix_socket_ancillary_data) on macos and other BSDs …

   This adds support for CMSG handling on macOS and fixes it on OpenBSD
   and other BSDs.
   
   When traversing the CMSG list, the previous code had an exception for
   Android where the next element after the last pointer could point to
   the first pointer instead of NULL.  This is actually not specific to
   Android: the `libc::CMSG_NXTHDR` implementation for Linux and
   emscripten have a special case to return NULL when the length of the
   previous element is zero; most other implementations simply return the
   previous element plus a zero offset in this case.
   
   This MR additionally adds `SocketAncillary::is_empty` because clippy
   is right that it should be added.

   

   reyk committed Mar 26, 2021
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