8186699: Clean up extra Derby files

Reviewed-by: asemenyuk

make/Images.gmk

@@ -550,6 +550,9 @@ ifndef OPENJDK
 	$(MKDIR) -p $(JDK_IMAGE_DIR)/db
 	cd $(JDK_IMAGE_DIR)/db && $(UNZIP) -q -o $< -x */index.html */KEYS */test/* *javadoc/* */docs/* */demo/* 2> /dev/null
 	cd $(JDK_IMAGE_DIR)/db && $(MV) db-derby-*-bin/* . && $(RM) -r db-derby-*-bin
+ifneq ($(OPENJDK_TARGET_OS), windows)
+	$(RM) $(JDK_IMAGE_DIR)/db/bin/*.bat
+endif
 	$(MKDIR) -p $(@D)
 	$(TOUCH) $@