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[libcxx] [test] Fix a test error with condvars with trivial destruction

Authored by mstorsjo on Feb 25 2021, 11:58 PM.

Description

[libcxx] [test] Fix a test error with condvars with trivial destruction

If the destructor is trivial (_LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION,
the constructor always is), the compiler warns about the
std::condition_variable being unused.

Add a cast to void to silence the warning about the object being unused.

Differential Revision: https://reviews.llvm.org/D97540