Log Message:
Updated to 5.25. This fixes build problem due to API changes of devel/libev.

5.25  Thu Nov 11 01:08:39 CET 2010
        - try a different approach on netbsd - netbsd 5 finally has marginally
          working pthreads, but still broken ucontext/sigaltstack.
        - openbsd 4.8 finally got their act together, Coro works out of the box
          with asm, setjmp and pthreads (no change, just informational).

5.24  Sat Oct 23 11:27:12 CEST 2010
        - port to the EV 4.0 API.
        - work around bugs in mingw32, making strawberry perl work
          out of the box.
        - correctly modify Coro::AIO function prototypes
          so that they reflect the "no optional parameters" rule.
        - "ported" libcoro to C++.