5292 findunref is both slow and broken

*** 29,41 ****
  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.%)
  
--- 29,38 ----