Ensure the BULD build system module produces a LSS listing file output when the "all" target is invoked.

LUFA/Build/lufa.build.in

@@ -153,8 +153,8 @@ size:
 	    avr-size $(SIZE_MCU_FLAG) $(SIZE_FORMAT_FLAG) $(TARGET).elf ; 2>/dev/null; \
 	 fi
 
-.PHONY: begin hex lss end size
+.PHONY: begin elf hex lss size end
-all: begin hex end size
+all: begin elf hex lss size end
 
 elf: $(TARGET).elf
 hex: $(TARGET).hex $(TARGET).eep