Bump arduino version for IDF builds

Fixes: espressif/arduino-esp32#708

Author: blue-2357

Makefile.projbuild

@@ -9,7 +9,7 @@ endif
 BOOT_APP_BIN_FLASH_CMD = $(ESPTOOLPY_SERIAL) write_flash $(BOOT_APP_BIN_OFFSET) $(BOOT_APP_BIN_PATH)
 ESPTOOL_ALL_FLASH_ARGS += $(BOOT_APP_BIN_OFFSET) $(BOOT_APP_BIN_PATH)
 
-CPPFLAGS += -DARDUINO=180 -DESP32=1 -DARDUINO_ARCH_ESP32=1
+CPPFLAGS += -DARDUINO=10800 -DESP32=1 -DARDUINO_ARCH_ESP32=1
 
 boot-app0:
 	@echo "Rebooting to APP0"