Fix building the DMD testsuite on a hardened OS

Author: wilzbach

test/Makefile

@@ -207,6 +207,6 @@ start_fail_compilation_tests: $(RESULTS_DIR)/.created $(RESULTS_DIR)/d_do_test$(
 $(RESULTS_DIR)/d_do_test$(EXE): d_do_test.d $(RESULTS_DIR)/.created
 	@echo "Building d_do_test tool"
 	@echo "OS: $(OS)"
-	$(QUIET)$(DMD) -conf= $(MODEL_FLAG) -unittest -run d_do_test.d -unittest
-	$(QUIET)$(DMD) -conf= $(MODEL_FLAG) -od$(RESULTS_DIR) -of$(RESULTS_DIR)$(DSEP)d_do_test$(EXE) d_do_test.d
+	$(QUIET)$(DMD) $(MODEL_FLAG) -unittest -run d_do_test.d -unittest
+	$(QUIET)$(DMD) $(MODEL_FLAG) -od$(RESULTS_DIR) -of$(RESULTS_DIR)$(DSEP)d_do_test$(EXE) d_do_test.d