Remove non-working WiFi examples and fix some that require changes

libraries/WiFi/examples/WiFiScan/WiFiScan.ino

@@ -37,7 +37,7 @@ void loop()
             Serial.print(" (");
             Serial.print(WiFi.RSSI(i));
             Serial.print(")");
-            Serial.println((WiFi.encryptionType(i) == ENC_TYPE_NONE)?" ":"*");
+            Serial.println((WiFi.encryptionType(i) == WIFI_AUTH_OPEN)?" ":"*");
             delay(10);
         }
     }