Merge pull request #58 from arduino-libraries/fix_mbed_build

Remove useless Arduino.h include

Author: aentinger

src/libmodbus/modbus.c

@@ -19,7 +19,6 @@
 #include <unistd.h>
 #endif
 #ifdef ARDUINO
-#include <Arduino.h>
 
 #ifndef DEBUG
 #define printf(...) {}