Test c++17 gnu++17

Author: Godeffroy

platformio.ini

@@ -35,6 +35,11 @@ lib_deps =
 	sparkfun/SparkFun Qwiic OTOS Arduino Library@^1.0.0
 	sparkfun/SparkFun Toolkit@^0.9.2
 	adafruit/Adafruit NeoPixel@^1.12.3
+build_unflags =
+	-std=gnu++11
+build_flags =
+	-std=c++17
+	-std=gnu++17
 
 [env:Esp32_NO_WIFI]
 upload_protocol = esptool