Fix tile SA_* conditions for POSIX.1:2008 (bug 21622)

[Chris Metcalf]

On 6/19/2017 11:08 AM, Joseph Myers wrote:
> As shown by conform/ tests once the remaining namespace issues are
> fixed, the tile bits/sigaction.h fails to declare SA_RESETHAND,
> SA_RESTART and SA_NODEFER for non-XSI POSIX.1:2008 as other versions
> do.  Those constants were moved from XSI to Base in the 2008 edition
> of POSIX.  This patch fixes the conditions to match other versions of
> this header.
>
> Tested (compilation only) for tilegx-linux-gnu with
> build-many-glibcs.py.

LGTM, thanks; please commit.

-- 
Chris Metcalf, Mellanox Technologies
http://www.mellanox.com