10804 Enable unused warnings outside of uts
Reviewed by: Andy Stormont <astormont@racktopsystems.com>
Reviewed by: Toomas Soome <tsoome@me.com>

*** 90,99 ****
--- 90,100 ----
  CERRWARN += -_gcc=-Wno-parentheses
  CERRWARN += -_gcc=-Wno-uninitialized
  CERRWARN += -_gcc=-Wno-switch
  CERRWARN += -_gcc=-Wno-char-subscripts
  CERRWARN += -_gcc=-Wno-type-limits
+ $(RELEASE_BUILD)CERRWARN += -_gcc=-Wno-unused
  
  SMOFF += no_if_block
  
  # Location of the shared relocation engines maintained under usr/src/uts.
  #