selftests/futex: Dynamically skip unsupported tests

Some new futex tests rely on kernel features that may not be supported
on all configurations (e.g., FUTEX2_NUMA or PR_FUTEX_HASH).
Currently, these tests fail with EINVAL when the features are missing.

Add dynamic skip logic to:

 - futex_priv_hash: Skip if PR_FUTEX_HASH returns ENOSYS or EINVAL.

 - futex_numa_mpol: Skip if futex2 or FUTEX2_NUMA returns ENOSYS or EINVAL.

This allows the tests to pass (as SKIPPED) on kernels without support,
while preserving coverage on configurations that do support them.

[ tglx: Adapt to harness changes, massage change log ]

Signed-off-by: Wake Liu <wakel@google.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260624070223.1533167-1-wakel@google.com

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