Update 4.15 to 4.18
-------------------
Changes marked with (libev) are changes in libev, and have more
documentation in the libev Changes file.

4.18 Sat Sep  6 20:37:23 CEST 2014
        - use slightly better weay to find includes, to support multiarch
          on newer perls.

4.17 Fri Apr 11 06:22:38 CEST 2014
        - perl5porters broke Async::Interrupt, BDB, EV, IO::AIO, OpenCL
          without warning by switching the meaning of USE_SOCKETS_AS_HANDLES
          in 5.18. What's so attractive about giving a shit about backwards
          compatibility - I will never understand.

4.16 Sat Mar  8 16:49:05 CET 2014
        - make sure EV::CHECK is available at all times.
        - avoid a spurious warning when perl -w overrides "no warnings".
        - use perl's signal implementation on WIN32.
        - ensure extern "C" function pointers are used for externally-visible
          pointers.
        - (libev) mark event pipe fd as cloexec after a fork (analyzed by Sami Farin).
        - (ecb) support m68k, m88k and sh (patch by Miod Vallat).
        - (libev) in the absence of autoconf, do not use the clock syscall
          on glibc >= 2.17 (avoids the syscall AND -lrt on systems
          doing clock_gettime in userspace).
        - (ecb) work around memory barriers and volatile apparently both being
          broken in visual studio 2008 and later (analysed and patch by Nicolas Noble).

(mef)