[libc] Fix putting tuple_size into libc++ namespace. (#201905) 633539bfa1516e616b798b2eae98bea689b3c410 added special-case for putting `tuple_size` into correct namespace when building with libc++. It uses `_LIBCPP_BEGIN_NAMESPACE_STD` macro, which recently started to contain more logic, including the Clang pragmas to ensure correct visibility. It also may also introduce warnings for `-Wpragma-clang-attribute` which need to be suppressed. After fad51d3f41482e148683e12741ac9abfbe49742d, this suppression only works for libc++ headers themselves (which define `#pragma GCC system_header`), but not for the user code. This change bypasses explicit ABI annotation macros in libc++ by switching to using `_LIBCPP_ABI_NAMESPACE` (that libc++ uses under the hood) if it's available.
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