[libc++] Fix feature test macro for __cpp_lib_to_chars
We would have been defining it in <utility> instead of <charconv>. For the time being, this doesn't change anything since we don't implement the feature test macro anyways. Also, as a fly-by, this removes obsolete feature test macro tests. There was a brief time back in the days when we wrote feature test macro tests manually. In particular, we had test files for __cpp_lib_to_chars and __cpp_lib_memory_resource. Since we now have a principled way of generating these tests with scripts, this commit removes the obsolete (and empty) tests for these two feature test macros. Differential Revision: https://reviews.llvm.org/D114243
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