[COMMITTED PATCH] Add stub sys/procfs.h file

[Roland McGrath]

> On Thu, 8 Jan 2015, Roland McGrath wrote:
> 
> > --- /dev/null
> > +++ b/sysdeps/nptl/sys/procfs.h
> > @@ -0,0 +1,39 @@
> > +/* Types used by thread_db callback interface.  Stub version.
> > +   Copyright (C) 2014 Free Software Foundation, Inc.
> 
> It's now 2015.

Yes, thanks.  I fixed it without bothering with a ChangeLog entry.