Make USB serial dependent on USB_SERIAL rather than DEBUG

radio/src/main.cpp

@@ -103,7 +103,7 @@ void openUsbMenu()
   if (popupMenuHandler != onUSBConnectMenu) {
     POPUP_MENU_ADD_ITEM(STR_USB_JOYSTICK);
     POPUP_MENU_ADD_ITEM(STR_USB_MASS_STORAGE);
-#if defined(DEBUG)
+#if defined(USB_SERIAL)
     POPUP_MENU_ADD_ITEM(STR_USB_SERIAL);
 #endif
     POPUP_MENU_TITLE(STR_SELECT_MODE);

radio/src/targets/common/arm/stm32/CMakeLists.txt

@@ -50,6 +50,7 @@ if(DEBUG OR CLI OR USB_SERIAL)
     ../common/arm/stm32/usbd_cdc.cpp
   )
   add_definitions(-DUSB_SERIAL)
+  message("-- Adding support for USB serial")
 endif()
 
 set(STM32USB_SRC