RPi: Add support for I2C

Add MyHw file for RaspberryPi.

Fix compilation warnings in x86.

Fix some error messages.

drivers/Linux/Arduino.h

@@ -18,6 +18,18 @@
 	using namespace rpi_util;
 #endif
 
+#undef PSTR
+#define PSTR(x) (x)
+#undef F
+#define F(x) (x)
+#define PROGMEM __attribute__(( section(".progmem.data") ))
+#define vsnprintf_P(...) vsnprintf( __VA_ARGS__ )
+#define snprintf_P(...) snprintf( __VA_ARGS__ )
+#define memcpy_P memcpy
+#define pgm_read_byte(p) (*(p))
+#define pgm_read_dword(p) (*(p))
+#define pgm_read_byte_near(p) (*(p))
+
 #define PI 3.1415926535897932384626433832795
 #define HALF_PI 1.5707963267948966192313216916398
 #define TWO_PI 6.283185307179586476925286766559