NamedMutex_UNIX incorrectly deletes named semaphores

[okaduki]

Description

As mentioned in the comment #271, this occurs when multiple processes use a NamedMutex with the same name.

The constructor in Foundation/src/NamedMutex_UNIX.cpp creates a semaphore if it does not exist and holds _owned=true.
If another process instantiates a NamedMutex with the same name, it holds its _semid.
After that, when a process with _owned=true terminates, the semaphore is deleted, but the _semid of the other process continues to remain.
Then, semop always fails because the semaphore has been deleted,

To Reproduce

1. Process A creates a NamedMutex
2. Process B creates a NamedMutex with the same name
3. Process A terminates
4. Process B acquires the lock (but fails)

Environment information

• OS Type and Version: Rocky Linux 8
• POCO Version: 1.12.1