Fix library ARCH issues

stm32duino / Arduino_Core_STM32 can't be compiled with Arduino Bridge/Ethernet/WiFi libraries.

examples/BlinkOnBridgeProp/BlinkOnBridgeProp.ino

@@ -1,3 +1,4 @@
+
 /* BlinkOnBridgeProp.ino
    MIT License (c) Faure Systems <dev at faure dot systems>
 

examples/BlinkOnStm32Nucleo144Prop/BlinkOnStm32Nucleo144Prop.ino

@@ -14,9 +14,10 @@
    - STM32 Nucleo-144 borads require: STM32duino LwIP and STM32duino STM32Ethernet libraries
 
 */
+#if defined(ARDUINO_ARCH_STM32)
 #include <LwIP.h>
 #include <STM32Ethernet.h>
-#include "Stm32Nucleo144Prop.h"
+//#include "Stm32Nucleo144Prop.h"
 #include "ArduinoProps.h"
 #include "Stm32Millis.h"
 extern Stm32MillisClass Stm32Millis;
@@ -119,3 +120,4 @@ void InboxMessage::run(String a) {
     prop.sendOmit(a);
   }
 }
+#endif