used library feature-test macros for std::is_(final|invocable) detection#34
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std::is_(final|invocable) detectionstd::is_(final|invocable) detection
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Former detection technique was flagged by libc++ v21 (
std::voidnot user-specializable). The technique could have been kept by making it rely on saystd::hash, but using feature macros was deemed simpler.