Fix sigevent namespace (bug 21543)

[Joseph Myers]

On Fri, 2 Jun 2017, Zack Weinberg wrote:

> On Fri, Jun 2, 2017 at 1:07 PM, Joseph Myers <joseph@codesourcery.com> wrote:
> >         [BZ #21543]
> >         * signal/signal.h: Only include <bits/types/sigevent_t.h> and
> >         <bits/sigevent-consts.h> if [__USE_POSIX199309], not if
> >         [__USE_XOPEN_EXTENDED].
> 
> LGTM.
> 
> Do you think you'll be able to fix signal.h namespace-wise all the way 
> for 2.26?

I don't know.  There are two patches pending review 
<https://sourceware.org/ml/libc-alpha/2017-05/msg00744.html> 
<https://sourceware.org/ml/libc-alpha/2017-06/msg00042.html>, but the big 
part (for XPG42 and later) is the ucontext issues.

-- 
Joseph S. Myers
joseph@codesourcery.com