Simplify validate_interval_range and callers
* src/textprop.c (validate_interval_range): Remove useless code. Fix comment to match current behavior. (set_text_properties, copy_text_properties): Simplify, as validate_interval_range has not incremented START or END for quite some time. (copy_text_properties): Assume C99. Fix an unlikely integer overflow bug if WIDE_EMACS_INT.
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