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libstdc++: Revert pre-C++23 support for 16-bit float types [PR111060]
In r14-3304-g1a566fddea212a and r14-3305-g6cf214b4fc97f5 I tried to enable std::format for 16-bit float types before C++23. This causes errors for targets where the types are defined but can't actually be used, e.g. i686 without sse2. Make the std::numeric_limits and std::formatter specializations for _Float16 and __bfloat16_t depend on the __STDCPP_FLOAT16_T__ and __STDCPP_BFLOAT16_T__ macros again, so they're only defined for C++23 when the type is fully supported. This is OK because the main point of my earlier commits was to add better support for _Float32 and _Float64. It seems fine for the new 16-bit types to only be supported for C++23, as they were never present before GCC 13 anyway. libstdc++-v3/ChangeLog: PR target/111060 * include/std/format (formatter): Only define specializations for 16-bit floating-point types for C++23. * include/std/limits (numeric_limits): Likewise.
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