`POLLHDRUP` is not implemented on AIX. Therefore `UV_DISCONNECT` will
never be set on `events`. This causes the socket to never be closed and
the tests to be stuck inside `pollset_poll` indefinitely, resulting in a
timeout.
This fixes the following tests:
- poll_duplex
- poll_unidirectional
Updated docs to let end users know that `UV_DISCONNECT` can be set, but
is unsupported on AIX.
Fixes: https://github.com/libuv/libuv/issues/844
PR-URL: https://github.com/libuv/libuv/pull/857
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>
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