increase TINYUSB_API_VERSION to 20400 for new _strid and new configuration builder

add backward compatible with core including pre-2.4.0 version

Author: hathach

src/arduino/Adafruit_TinyUSB_API.h

@@ -30,7 +30,7 @@
 
 // API Version, need to be updated when there is changes for
 // TinyUSB_API, USBD_CDC, USBD_Device, USBD_Interface,
-#define TINYUSB_API_VERSION 20000
+#define TINYUSB_API_VERSION 20400
 
 //--------------------------------------------------------------------+
 // Core API

src/arduino/Adafruit_USBD_CDC.cpp

@@ -64,8 +64,14 @@ uint16_t Adafruit_USBD_CDC::getInterfaceDescriptor(uint8_t itfnum_deprecated,
     ep_out = TinyUSBDevice.allocEndpoint(TUSB_DIR_OUT);
   }
 
+#if TINYUSB_API_VERSION < 20400
+  // backward compatible for core that include pre-2.4.0 TinyUSB
+  uint8_t _strid = 0;
+#endif
+
   uint8_t const desc[] = {
       TUD_CDC_DESCRIPTOR(itfnum, _strid, ep_notif, 8, ep_out, ep_in, 64)};
+
   uint16_t const len = sizeof(desc);
 
   // null buffer is used to get the length of descriptor only