Split up stackguard-macros.h into sysdeps directories

[Roland McGrath]

> On Tue, 15 May 2012, Roland McGrath wrote:
> 
> > If it's only used inside elf/ and the #include is fixed to <> then the
> > generic file can stay in elf/ rather than moving to sysdeps/generic/.  The
> > file should get a comment saying it might be overridden by a sysdeps file.
> 
> It's not only used inside elf/.  This file is included by two tests, 
> elf/tst-stackguard1.c and nptl/tst-stackguard1.c.

OK.  Then I think your change is fine as is.


Thanks,
Roland