[CRIU] Fix building against 4.18

[Andrei Vagin]

Radostin,

What do you think about these patches?

For me, it looks good.

On Mon, Jul 09, 2018 at 06:28:25AM +0000, Adrian Reber wrote:
> In one of the patch discussion about 4.18 it was mentioned that maybe
> it would make sense to pull in the aio kernel headers into CRIU.
> 
> With the following two patches travis is really happy and CRIU
> passes compile and test again also with 4.18.
> 
> There has been some movement on the kernel side, so not sure if we
> should really merge this patch or not:
> 
> https://lore.kernel.org/lkml/20180708204359.GA19198@lst.de/
> 
> Maybe merge it now and revert it later once the kernel is fixed.
> 
> 		Adrian