Unify the ioctl declarations on linux

[espindola]

I originally wanted to have all versions take a c_uint, since that is what the kernel expects on the other side. I then found that the test infrastructure, quite reasonably, enforces that the symbol matches what the C library provides.

So this PR is now just a small cleanup that uses the existing Ioctl type to reduce duplication.

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[bors]

:umbrella: The latest upstream changes (presumably #3777) made this pull request unmergeable. Please resolve the merge conflicts.

[espindola]

This is a nice cleanup, thanks. Could you double check that the tests in libc-test/semver are up to date?

I can't run the tests, since ctest2 complains that

  unknown os/family: x86_64-alpine-linux-musl
``

But they passed on CI and I didn't change what gets exported.

[espindola]

But they passed on CI and I didn't change what gets exported.

In fact, ioctl is listed in unix.txt, so it is already expected everywhere.

[tgross35]

Thanks for confirming!