[libc++] Remove libc++'s <float.h> (#175849) The existence of <float.h> in libc++ leads to difficulties with modules, especially when it comes to supporting the various __need macros supported by the Clang builtin headers. Fortunately, libc++'s <float.h> only defines FLT_EVAL_METHOD and DECIMAL_DIG, which are already defined by the Clang builtin headers in C++11 mode. Hence, removing the header entirely should have no impact, apart from not defining FLT_EVAL_METHOD and DECIMAL_DIG in C++03 mode. However, that is arguably something that libc++ shouldn't be doing: if the underlying C library doesn't want to provide these definitions, then libc++ shouldn't force it to.
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