- update to version 4,11
  - INCOMPATIBLE CHANGE: ev_timer_again now clears the pending
    status, as was documented already, but not implemented in the
    repeating case.
  - new compiletime symbols: EV_NO_SMP and EV_NO_THREADS.
  - fix a race where the workaround against the epoll fork bugs
    caused signals to not be handled anymore.
  - correct backend_fudge for most backends, and implement a
    windows specific workaround to avoid looping because we call
    both select and Sleep, both with different time resolutions.
  - document range and guarantees of ev_sleep.
  - document reasonable ranges for periodics interval and offset.
  - rename backend_fudge to backend_mintime to avoid future
    confusion :)
  - change the default periodic reschedule function to hopefully
    be more exact and correct even in corner cases or in the far
    future.
  - do not rely on -lm anymore: use it when available but use our
    own floor () if it is missing. This should make it easier to
    embed, as no external libraries are required.
  - strategically import macros from libecb and mark rarely-used
    functions as cache-cold (saving almost 2k code size on typical
    amd64 setups).
  - add Symbols.ev and Symbols.event files, that were missing.
  - fix backend_mintime value for epoll (was 1/1024, is 1/1000 now).
  - fix #3 "be smart about timeouts" to not "deadlock" when
    timeout == now, also improve the section overall.
  - avoid "AVOIDING FINISHING BEFORE RETURNING" idiom.
  - support new EV_API_STATIC mode to make all libev symbols
    static.

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