[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

--- Comment #1 from github-bugzilla at puremagic.com ---
Commit pushed to master at https://github.com/dlang/druntime

https://github.com/dlang/druntime/commit/e43b889a331323790ce151533223ac6ec8166a79
fix issue 18923 - Semaphore internal handle should be `protected`

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