Add extra_script.py to pass -Wl,--allow-multiple-definition to linker for duplicate TinyUSB symbol fix

extra_script.py

@@ -0,0 +1,3 @@
+Import("env")
+
+env.Append(LINKFLAGS=["-Wl,--allow-multiple-definition"])

platformio.ini

@@ -19,6 +19,8 @@ build_flags =
     -DARDUINO_USB_CDC_ON_BOOT=1
     -DUSE_TINYUSB=1
 
+extra_scripts = pre:extra_script.py
+
 monitor_speed = 115200
 
 board_build.partitions = default_8MB.csv