Hack around F() macro and PSTR for running on Due

Due.h

@@ -0,0 +1,25 @@
+// redefine some stuff so code works on Due
+// http://arduino.cc/forum/index.php?&topic=153761.0
+
+#ifndef Due_h
+#define Due_h
+
+#if defined(__SAM3X8E__)
+    #define PROGMEM
+    #define pgm_read_byte(x)        (*((char *)x))
+//  #define pgm_read_word(x)        (*((short *)(x & 0xfffffffe)))
+    #define pgm_read_word(x)        ( ((*((unsigned char *)x + 1)) << 8) + (*((unsigned char *)x)))
+    #define pgm_read_byte_near(x)   (*((char *)x))
+    #define pgm_read_byte_far(x)    (*((char *)x))
+//  #define pgm_read_word_near(x)   (*((short *)(x & 0xfffffffe))
+//  #define pgm_read_word_far(x)    (*((short *)(x & 0xfffffffe)))
+    #define pgm_read_word_near(x)   ( ((*((unsigned char *)x + 1)) << 8) + (*((unsigned char *)x)))
+    #define pgm_read_word_far(x)    ( ((*((unsigned char *)x + 1)) << 8) + (*((unsigned char *)x))))
+    #define PSTR(x)  x
+  #if defined F
+    #undef F
+  #endif
+  #define F(X) (X)
+#endif
+
+#endif