[PATCH 4/6] sysvipc: Return EINVAL for invalid msgctl commands

[Florian Weimer]

* Adhemerval Zanella via Libc-alpha:

> It avoids regressions on possible future commands that might require
> additional libc support.  The downside is new commands added by newer
> kernels will need further glibc support.

Looks okay to me for now.

I think eventually we need to rethink what we want to do about these,
for the architectures that don't need translation.

Thanks,
Florian
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