Simplify check for verbosity

Just check for $(VERBOSE) or $(verbose) being non-empty instead of
checking for $(VERBOSE) equalling "TRUE". Isn't our normal way to do a
verbose make to pass verbose=t?

Change-Id: Ic4ddc1fe025fed55ca56fd21b615640c389c0454

instsetoo_native/CustomTarget_install.mk

@@ -88,8 +88,7 @@ $(foreach pkgformat,$(5),\
 	) \
 	$(4) \
 	-format $(pkgformat) \
-	$(if $(filter TRUE,$(VERBOSE)),-verbose, \
-		$(if $(findstring s,$(MAKEFLAGS)),-quiet)) \
+	$(if $(VERBOSE)$(verbose),-verbose,-quiet) \
 )
 endef