Avoid a warning in clang that IS_64BIT is already defined#4485

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maximmasiutin wants to merge 1 commit intoofficial-stockfish:masterfrom maximmasiutin:is-int64-already-defined-warning

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Commits on Apr 1, 2023

Avoid a warning in clang (LLVM) compiler that IS_64BIT is already defined by checking whether it was defined earlier, before defining it
maximmasiutin
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