cleanup PT_GNU_STACK size handling

[Hans-Peter Nilsson]

On Mon, 22 Oct 2012, Hans-Peter Nilsson wrote:

> On Mon, 22 Oct 2012, Alan Modra wrote:
>
> > On Tue, Oct 16, 2012 at 03:45:37PM +0100, Nathan Sidwell wrote:
> > > + 		  /* For default_execstack to trigger without an explicit
> > > + 		     stack size, there must be an input note section.  */
> > Nope.  The default triggers on the *absence* of a note section.
>
> FWIW, the default in absence of a note is actually target-specific.
> (grep for DEFAULT_STACK_PERMS in glibc.)

...which IIUC is provided for in the patch.  Sorry, ignore-me.

brgds, H-P