handy.h - Allow NEGATE_2U to be used in EXT, not just CORE

Author: richardleach

handy.h

@@ -3103,7 +3103,7 @@ STMT_START {                    \
     (x) ^= ((x) << 26);         \
 } STMT_END
 
-#ifdef PERL_CORE
+#if defined(PERL_CORE) || defined(PERL_EXT)
 /* Convenience macros for dealing with IV_MIN:
    In two's complement system, the absolute value of IV_MIN (i.e. -IV_MIN)
    cannot be represented in an IV.  Thus we cannot use simple negation