make Condvar, Mutex, RwLock const constructors work with the `unsupported` impl#98457

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bors merged 1 commit intorust-lang:masterfrom

japaric:gh98378

Sep 25, 2022

Commits on Jun 27, 2022

make Condvar, Mutex, RwLock const constructors work with unsupported impl
japaric
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