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

@@ -1035,10 +1035,12 @@
 CERRWARN += -_gcc=-Wno-char-subscripts
 CERRWARN += -_gcc=-Wno-clobbered
 CERRWARN += -_gcc=-Wno-unused-function
 CERRWARN += -_gcc=-Wno-address
 
+$(RELEASE_BUILD)CERRWARN += -_gcc=-Wno-unused
+
 # not linted
 SMATCH=off
 
 # Setting THREAD_DEBUG = -DTHREAD_DEBUG (make THREAD_DEBUG=-DTHREAD_DEBUG ...)
 # enables ASSERT() checking in the threads portion of the library.