Use the libc++ detection instead of clang detection around std:isinfinite #52164
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Fixes #52163
The libc++ vs libstdc++ detection in the pre-processor is taken from https://stackoverflow.com/questions/31657499/how-to-detect-stdlib-libc-in-the-preprocessor
Note that in our case
std:isinfinitepresents means that we don't need to import any additional headers to guarantee the_LIBCPP_VERSIONpresents for thelibc++.