Log Message:
(devel/p5-EV) Updated from 4.28 to 4.30

4.30 Fri Nov 22 21:00:00 CET 2019
        - (libev) use a different and hopefully even more portable
          test to disable io_uring when header files are too old,
          by directly testing LINUX_VERSION_CODE.
        - (libev) fix a bug in the io_uring backend that polled the wrong
          backend fd, causing it to not work in many cases.

4.29 Fri Nov 22 15:34:29 CET 2019
        - (libev) add io uring autoconf and non-autoconf detection,
          the latter of which should disable io_uring compilation
          on old systems.