Disabled std forward declarations when libc++ is 16 or newer. - #1863
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The latest Apple clang from Xcode 27.0 beta 1 ships a libc++ that provides its own forward declarations of the standard containers.
meta.hpp also forward-declares them on Apple compilers, so now they conflict and lead to a build error.
So this PR skips them when
_LIBCPP_VERSION >= 160000.