upx: fix build error

g++ -O2 -Wall -W -Wcast-align -Wcast-qual -Wpointer-arith -Wshadow -Wwrite-strings -Werror -o compress.o -c compress.cpp
cc1plus: warnings being treated as errors
compress.cpp:75: error: unused parameter 'src'
...

SVN-Revision: 28500

tools/upx/Makefile

@@ -20,7 +20,8 @@ include $(INCLUDE_DIR)/host-build.mk
 
 define Host/Compile
 	rm -f $(HOST_BUILD_DIR)/src/.depend
-	$(MAKE) UPX_LZMADIR="$(BUILD_DIR_HOST)/lzma-4.65" -C $(HOST_BUILD_DIR)/src
+	$(MAKE) UPX_LZMADIR="$(BUILD_DIR_HOST)/lzma-4.65" -C $(HOST_BUILD_DIR)/src \
+		CXXFLAGS_WERROR=
 endef
 
 define Host/Install