Sync'ing up jdk7 at b50

[Alan Bateman]

Andrew John Hughes wrote:
> :
> Our preferred way to handle this is to check for fstatat via configure
> and use HAVE_FSTATAT as the define rather than doing something as
> blunt as #defined(__linux__).  Is there an equivalent in Sun's
> Makefile nomenclature?
>   
It's a bit different in that we need to check for it at runtime (because 
we may be running on a different system to where the build was done).

-Alan.