test/include.mk: true is not '/bin/true` (#1813)

Author: ttuegel

test/include.mk

@@ -71,7 +71,7 @@ $(DEF_KORE_DEFAULT): $(DEF_DIR)/$(DEF).k $(K)
 	$(DIFF) $@.golden $@ || $(FAILED)
 
 %.verify.out: $(DEF_KORE_DEFAULT)
-	$(KORE_PARSER) $(DEF_KORE_DEFAULT) --verify >/dev/null 2>$@ || /bin/true
+	$(KORE_PARSER) $(DEF_KORE_DEFAULT) --verify >/dev/null 2>$@ || true
 	$(DIFF) $@.golden $@ || $(FAILED)
 
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