[PATCH] linux/semctl: fix SEM_STAT_ANY support [BZ #26637]

[Florian Weimer]

* Dmitry V. Levin:

> Handle SEM_STAT_ANY the same way as SEM_STAT so that the buffer argument
> of SEM_STAT_ANY is properly passed to the kernel and back.
>
> * sysdeps/unix/sysv/linux/semctl.c (semun64_to_ksemun64,
> semun_to_semun64, __semctl, __semctl_mode16, __old_semctl): Handle
> SEM_STAT_ANY.

As a stop-gap measure, this is okay, but we really need to reconsider
what we are doing here.  We really need to return EINVAL if we do not
recognize the cmd value.  It means patching glibc each time the system
call is enhanced, but I don't see a way around that.

Thanks,
Florian
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