[core] fdevent_poll_poll avoid potential race

fdevent_poll_poll avoid potential race with pollfds list being extended

[core] avoid select() FD_ISSET repeat on active fds

[core] pass fdn to fdevent_sched_close,_unregister

remove issock flag; on _WIN32, select(), WSAPoll() work only on sockets

[multiple] employ ck_calloc, ck_malloc shared code

employ ck_calloc(), ck_malloc() shared code to slightly reduce code size
(centralize the ck_assert() to check that memory allocation succeeded)

[multiple] employ ck_realloc_u32() shared code

employ ck_realloc_u32() shared code to slightly reduce code size

[core] remove libev fdevent option (ignore)

lighttpd directly uses native OS event handlers

[core] libev EV_ERROR conflicts with kqueue

libev EV_ERROR conflicts with kqueue sys/event.h EV_ERROR

[core] close backend socket fds more quickly

(thx ThomasDevoogdt)

close backend socket fds more quickly by polling with zero timeout when
there are pending fds scheduled to be closed after the next

[core] close backend socket fds more quickly

(thx ThomasDevoogdt)

close backend socket fds more quickly by polling with zero timeout when
there are pending fds scheduled to be closed after the next poll.

x-ref:
"Slow request handling in Lighttpd 1.4.60"
https://redmine.lighttpd.net/boards/2/topics/10063

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[core] merge fdevent impls into fdevent_impl.c

[core] fdevent_impl.c separate from fdevent.c