Upstreaming the glibc Hurd port

[Samuel Thibault]

Samuel Thibault, on lun. 02 avril 2018 17:50:17 +0200, wrote:
> There are a few remaining namespace issues due to missing __ marking or
> spurious #includes.

One issue is with struct sched_param.  The __sched_param definition
was removed in glibc while htl's pthread_attr uses it.  For now I just
made struct___pthread_attr.h include <sched.h> but that brings things
unwanted for <sys/types.h> (which is supposed to pull pthread_attr).

So I guess we should revert to defining __sched_param?

Samuel