another release candidate

[Marc Lehmann]

Since there was an uncharacteristically big list of bugs in the last rc, I
decided to build another rc, mainly for those who wish to verify that it
works now - as always, feedback appreciated, and thanks to everybody who
gave feedback before.

   http://data.plan9.de/libev-4.11.tar.gz

(same url, updated file)

Changes for the rc relative to 4.11:

        - destroying a non-default loop would stop the global waitpid
          watcher (Denis Bilenko).
        - queueing pending watchers of higher priority from a watcher now invokes
          them in a timely fashion (reported by Denis Bilenko).
        - add throw() to all libev functions that cannot throw exceptions, for
          further code size decrease when compiling for C++.
        - add throw () to callbacks that must not throw exceptions (allocator,
          syserr, loop acquire/release, periodic reschedule cbs).
        - fix event_base_loop return code, add event_get_callback, event_base_new,
          event_base_get_method calls to improve libevent 1.x emulation and add
          some libevent 2.x funcitonality (based on a patch by Jeff Davey).
        - add more memory fences to fix a bug reported by Jeff Davey. Better
          be overfenced than underprotected.
        - ev_run now returns a boolean status (true meaning watchers are
          still active).
        - ev_once: undef EV_ERROR in ev_kqueue.c, to avoid clashing with
          libev's EV_ERROR (reported by 191919).
        - (ecb) add memory fence support for xlC (Darin McBride).
        - (ecb) add memory fence support for gcc-mips (Anton Kirilov).
        - (ecb) add memory fence support for gcc-alpha (Christian Weisgerber).
        - work around some kernels losing file descriptors by leaking
          the kqueue descriptor in the child.
        - include sys/syscall.h instead of plain syscall.h.
        - check for io watcher loops in ev_verify, check for the most
          common reported usage bug in ev_io_start.
        - chose socket vs. WSASocket at compiletime using EV_USE_WSASOCKET.
        - always use WSASend/WSARecv directly on windows, hoping that this
          works in all cases (unlike read/write/send/recv...).

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