Make test-results not fail so it shows all results

For some reason 'make -k test-results' isn't always doing
the -k (continue-on-error) on Windows.

configure/RULES_BUILD

@@ -353,7 +353,7 @@ testspec: $(TESTSCRIPTS)
 test-results: tapfiles
 ifneq ($(strip $(TAPFILES)),)
 ifdef RUNTESTS_ENABLED
-	$(PROVE) --failures --ext .tap --exec "$(CAT)" --color $(TAPFILES)
+	-$(PROVE) --failures --ext .tap --exec "$(CAT)" --color $(TAPFILES)
 endif
 
 CURRENT_TAPFILES := $(wildcard $(TAPFILES))