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handy.h: Set macro to false if can't ever be true
It's unlikely that perl will be compiled with out the LC_CTYPE locale category being enabled. But if it isn't, there is no sense in having per-interpreter variables for various conditions in it, and no sense having code that tests those variables. This commit changes a macro to always yield 'false' when this is disabled, adds a new similar macro, and changes some occurrences that test for a variable to use the macros instead of the variables. That way the compiler knows these to conditions can never be true.
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