5292 findunref is both slow and broken

@@ -29,13 +29,10 @@
 CFLAGS += $(CCVERBOSE)
 LINTFLAGS += -ux
 
 include ../Makefile.tools
 
-CERRWARN += -_gcc=-Wno-unused
-CERRWARN += -_gcc=-Wno-parentheses
-
 $(ROOTONBLDMAN1FILES) := FILEMODE=      644
 
 EXCEPTION_SRC= common open
 EXCEPTION_LISTS=        $(EXCEPTION_SRC:%=exception_list.%)