fix(NamedEvent): Release semaphore ID in dtor when created with semget (fixes #2971)

[matejk]

When a semaphore id is created with semget, it is released in dtor with semctl(..IPC_RMID).

[matejk]

Releasing semaphore IDs on Linux seems to be solved, however it seems that named event is not correctly implemented on macOS also.

The following test throws exception with errno 28 (ENOSPC):

		int i = 0;
		for (; i < 40000; i++)
		{
			name = std::string("TestEvent ") + std::to_string(i);
			NamedEvent* ne = new NamedEvent(name);
			delete ne;
		}

sem_unlink shall probably be called somewhere, however I am not familiar with semaphores in details.