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Works towards P0619R4/#99985. - std::uncaught_exception was not previously deprecated. This patch deprecates it since C++17 as per N4259. std::uncaught_exceptions is used instead as libc++ unconditionally provides this function. - _LIBCPP_ENABLE_CXX20_REMOVED_UNCAUGHT_EXCEPTION restores std::uncaught_exception. - As a drive-by, this patch updates the C++20 status page to explain that D.11 is already done, since it was done in 578d09c1b195d859ca7e62840ff6bb83421a77b5.