Split part of sys/eventfd.h into bits/eventfd.h

[Joseph S. Myers]

On Fri, 10 Feb 2012, Roland McGrath wrote:

> That seems sound to me.  
> 
> I think it's nicer to 0-pad out the integer constants so that all the ones
> near each other use the same number of digits.  Some of the kernel headers
> are consistent that way while others are not, but there's no reason not to
> make ours more uniformly pleasant to read.

They still won't actually line up unless space padding is added before or 
after the '=' in the enum - should that be added as well?

-- 
Joseph S. Myers
joseph@codesourcery.com