require kgio 2.5 for kgio_wait_readable(timeout)

Since kgio_wait_*able in kgio 2.5 takes an optional timeout
argument, we no longer have to load the extra "io/wait" module.
This saves us a small amount of some memory and also removes the
extra ioctl(FIONREAD) syscall IO#wait enforces.

Like IO#wait in Ruby 1.9.3dev, kgio_wait_readable may use
ppoll() to wait on high-numbered file descriptors as efficiently
as it waits on low-numbered descriptors.

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