[libc] Remove unused target conditionals for Apple platforms (#119030) It seems that LIBC_TARGET_OS_IS_MACOS and LIBC_TARGET_OS_IS_IPHONE were never actually used in the code, so these definitions can be removed. I came across these because libc++ now depends on llvm-libc to build (for from_chars), and the unguarded use of TargetConditionals.h broke some of our downstream configurations. There are some platforms for which `__APPLE__` is defined but that don't provide TargetConditionals.h. If there is a need to keep defining those, the compiler also provides some uglier macro definitions like __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ that do not require including any header.
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