gkehren
9d217e051b
PrivateIPC= sets up a private mqueue mount for the service. When CONFIG_POSIX_MQUEUE is disabled, mounting mqueue fails with ENODEV and prevents the service from starting. Treat ENODEV as an unavailable optional kernel feature while preserving the private IPC namespace. Keep all other mount errors fatal. Add coverage verifying that PrivateIPC= still creates a separate IPC namespace when POSIX message queues are unavailable. Fixes #42582
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