Log Message:
Update p5-IO-AIO to 4.18.

Revision history for IO::AIO

4.18  Thu Oct 11 07:01:26 CEST 2012
	- fix unintended xthread_create by intentionalising it :)

4.17  Thu Oct 11 05:19:47 CEST 2012
        - rename aio_fallocate to aio_allocate, to match documentation.
	- add list of linux fsid values to aio_statvfs docs.
        - work around a bug in btrfs' FIEMAP ioctl implementation.
        - work around AIX bug: statvfs.f_fsid is a struct, not unsigned long
          as per unix spec.

4.16  Tue Aug 14 05:39:03 CEST 2012
	- aio_statvfs was wromgly marked for wd emulation, causing
          it to malfunction for paths.
        - fix a crash in aio_fiemap, when used on ranges without any
          extents.
        - work around linux kernel bug (at least in 3.2): kernel might
          trash fiemap input arguments.
        - work around linux kernel bug (at least in 3.2): kernel does not
          set FIEMAP_EXTENT_LAST on last segment.
        - work around linux kernel bug (at least in 3.2): kernel silently
          truncates segment count if a file.
	- make fh argument of IO::AIO::mmap optional, also add mmap/munmap
          to quick overview.
        - splice can corrupt data.
        - (libeio) remove pread/pwrite emulation.
        - do not grow mmaped scalars in aio_read.
        - add FALLOC_FL_PUNCH_HOLE and document fallocate.
        - provide pread/pwrite for win32, making it link again on native win32.