* regex.c (RETALLOC_IF): Define only if needed.
(WORDCHAR_P): Likewise. This one is never needed, but is used only in a comment talking about a compiler bug, so put inside the #if 0 of that comment. (CHARSET_LOOKUP_BITMAP, FAIL_STACK_FULL, RESET_FAIL_STACK): (PUSH_FAILURE_ELT, BUF_PUSH_3, STOP_ADDR_VSTRING): Remove; unused.
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