Update libev to version 4.04.
Provided by Oleksandr Kozachuk in PR pkg/44690

Changes:

4.04 Wed Feb 16 09:01:51 CET 2011
  - fix two problems in the native win32 backend, where reuse of fd's
    with different underlying handles caused handles not to be removed
    or added to the select set (analyzed and tested by Bert Belder).
  - do no rely on ceil() in ev_e?poll.c.
  - backport libev to HP-UX versions before 11 v3.
  - configure did not detect nanosleep and clock_gettime properly when
    they are available in the libc (as opposed to -lrt).

4.03 Tue Jan 11 14:37:25 CET 2011
  - officially support polling files with all backends.
  - support files, /dev/zero etc. the same way as select in the epoll
    backend, by generating events on our own.
  - ports backend: work around solaris bug 6874410 and many related ones
    (EINTR, maybe more), with no performance loss (note that the solaris
    bug report is actually wrong, reality is far more bizarre and broken
    than that).
  - define EV_READ/EV_WRITE as macros in event.h, as some programs use
    #ifdef to test for them.
  - new (experimental) function: ev_feed_signal.
  - new (to become default) EVFLAG_NOSIGMASK flag.
  - new EVBACKEND_MASK symbol.
  - updated COMMON IDIOMS SECTION.


(asau)