[LTP] semctl: use IPC_PRIVATE to minimize interference.

[linuxtestproject.agent@gmail.com]

Hi Stephen,

On Tue, 14 Apr 2026 12:51:14 -0400, Stephen Bertram wrote:
> semctl: use IPC_PRIVATE to minimize interference.

> This update solves previous issues when tests were
> run in parallel with multiple workers in tmt.

Since you describe this as fixing a bug, a Fixes: tag is expected. Please
add one pointing to the commit that introduced the named-key usage. If
that commit predates LTP's git history, mention it in the cover letter.

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