[PATCH v3 2/3] y2038: linux: Provide __mq_timedsend_time64 implementation

[Florian Weimer]

* Lukasz Majewski:

> Just to be 100% sure - is it required for "internal" glibc headers to
> have the same set of included headers ?

There is no absolute requirement.  But header variance does lead to
tree breakage on architectures which are less often in builds.
build-many-glibcs.py has helped to catch these issues much earlier,
but it's still difficult to predict which changes benefit from
pre-commit checking using build-many-glibcs.py.  Adding more header
variance doesn't make that easier.