[Issue 18923] Semaphore internal handle should be `protected` instead of `private`

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18923

Basile B. <b2.temp at gmx.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Semaphore internal handle   |Semaphore internal handle
                   |should be protected         |should be `protected`
                   |                            |instead of `private`

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