[libcxx] Define _LIBCPP_HAS_C8RTOMB_MBRTOC8 for picolibc #158648
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Starting from picolibc 1.8.9, the
char8_trelated functions are provided.This patch adds logic to detect the underlying picolibc version and define the
_LIBCPP_HAS_C8RTOMB_MBRTOC8 macroaccordingly.