Solve the pgmspace.h problem centrally.

We previously put replacements for the von Neuman architecture
into arduino.h already, now let's complete this by having only
one #include <avr/pgmspace.h> in arduino.h. Almost all sources
include arduino.h anyways, so this is mostly a code reduction.

arduino.h

@@ -71,14 +71,20 @@
 
   For the AVR definitions, see /usr/lib/avr/include/avr/pgmspace.h on Linux.
 */
-#ifndef __AVR__
+#ifdef __AVR__
+
+  #include <avr/pgmspace.h>
+
+#else
+
   #define PROGMEM
   #define PGM_P const char *
   #define PSTR(s) ((const PROGMEM char *)(s))
   #define pgm_read_byte(x) (*((uint8_t *)(x)))
   #define pgm_read_word(x) (*((uint16_t *)(x)))
   #define pgm_read_dword(x) (*((uint32_t *)(x)))
-#endif /* ! __AVR__ */
+
+#endif /* __AVR__, ! __AVR__ */
 
 /*
 	ports and functions

dda.h

@@ -11,15 +11,6 @@
 	#endif
 #endif
 
-#ifndef SIMULATOR
-  #include <avr/pgmspace.h>
-#else
-  #define PROGMEM
-#endif
-
-/*
-	types
-*/
 
 // Enum to denote an axis
 enum axis_e { X = 0, Y, Z, E, AXIS_COUNT };

heater.c

@@ -6,7 +6,6 @@
 
 #include	<stdlib.h>
 #include	<avr/eeprom.h>
-#include	<avr/pgmspace.h>
 
 #include	"arduino.h"
 #include	"debug.h"

serial.h

@@ -3,9 +3,6 @@
 
 #include "config_wrapper.h"
 #include	<stdint.h>
-#ifdef __AVR__
-#include	<avr/pgmspace.h>
-#endif
 #include "simulator.h"
 
 #ifdef USB_SERIAL

sersendf.c

@@ -5,9 +5,6 @@
 */
 
 #include	<stdarg.h>
-#ifndef SIMULATOR
-#include	<avr/pgmspace.h>
-#endif
 
 #include	"serial.h"
 #include	"sermsg.h"

sersendf.h

@@ -1,11 +1,9 @@
 #ifndef	_SERSENDF_H
 #define	_SERSENDF_H
 
-#ifndef SIMULATOR
-#include	<avr/pgmspace.h>
-#endif
 #include "arduino.h"
 
+
 void sersendf(char *format, ...)		__attribute__ ((format (printf, 1, 2)));
 void sersendf_P(PGM_P format_P, ...)	__attribute__ ((format (printf, 1, 2)));