[PATCH 13/14 v7] Do not stack-protect sigreturn stubs.

[Florian Weimer]

On 06/07/2016 01:06 PM, Nix wrote:
> 	* signal/Makefile (CFLAGS-sigreturn.c): Use
> 	$(no-stack-protector).

I still don't think C implementations of sigreturn are reliable (in the 
sense that they keep working despite future compiler changes).  I think 
it's just laziness not have a separate .S file.

But there does not seem to be consensus about this alternative approach, 
so this patch is okay.

Thanks,
Florian