Fix WiFiNINA issue for Arduino Nano Connect (#403)

Fixes #373 

variants/arduino_nano_connect/nina_pins.h

@@ -8,16 +8,6 @@
  ******************************************************************************/
 
 #include "Arduino.h"
-//#include "WiFiNINA.h"
-/******************************************************************************
- * PREPROCESSOR-MAGIC
- ******************************************************************************/
-
-#if __has_include("WiFiNINA.h")
-#  define NINA_ATTRIBUTE
-#else
-#  define NINA_ATTRIBUTE __attribute__ ((error("Please include WiFiNINA.h to use this pin")))
-#endif
 
 /******************************************************************************
  * TYPEDEF
@@ -37,12 +27,10 @@ enum NinaPin {
  * FUNCTION DECLARATION
  ******************************************************************************/
 
-void      NINA_ATTRIBUTE pinMode     (NinaPin pin, PinMode mode);
-PinStatus NINA_ATTRIBUTE digitalRead (NinaPin pin);
-void      NINA_ATTRIBUTE digitalWrite(NinaPin pin, PinStatus value);
-int       NINA_ATTRIBUTE analogRead  (NinaPin pin);
-void      NINA_ATTRIBUTE analogWrite (NinaPin pin, int value);
-
-#undef NINA_ATTRIBUTE
+void      pinMode     (NinaPin pin, PinMode mode);
+PinStatus digitalRead (NinaPin pin);
+void      digitalWrite(NinaPin pin, PinStatus value);
+int       analogRead  (NinaPin pin);
+void      analogWrite (NinaPin pin, int value);
 
 #endif /* _NINA_PINS_ */