wrong placement of arduino.h

My code begins with something like that

```
#if defined(__AVR_ATtiny85__) 
  const int Pin0 = 0;
#else
  const int Pin0 = 4;
#endif 

byte something;
```

Compiling it for any none **AVR_ATtiny85** leads to an error due to wrong arduino.h placement into the if-else part.

Adding a dummy declaration at the start (in front of #if) omits the error... but a real fix would be better.
