[COMMITTED] Fix build warnings in some test cases due to missing include

[Joseph S. Myers]

On Mon, 18 Feb 2013, Siddhesh Poyarekar wrote:

>  2013-02-18  Siddhesh Poyarekar  <siddhesh@redhat.com>
>  
> +	* misc/tst-pselect.c: Include stdlib.h for declaration of exit.
> +	* nptl/sysdeps/pthread/tst-timer.c: Likewise.
> +	* nptl/tst-barrier4.c: Likewise.
> +	* nptl/tst-robust7.c: Likewise.

nptl/ has its own ChangeLog.

-- 
Joseph S. Myers
joseph@codesourcery.com