intial fix for solarsensor that skid implemented. Will add functioning code after, for now it will allow users to compile at least the SDL interface.

src/sdl/SDL.cpp

@@ -2688,10 +2688,20 @@ u32 systemReadJoypad(int which)
 {
 	return inputReadJoypad(which);
 }
+//static u8 sensorDarkness = 0xE8; // total darkness (including daylight on rainy days)
+
+void systemUpdateSolarSensor()
+{
+}
+
+void systemCartridgeRumble(bool)
+{
+}
 
 void systemUpdateMotionSensor()
 {
 	inputUpdateMotionSensor();
+	systemUpdateSolarSensor();
 }
 
 int systemGetSensorX()
@@ -2704,6 +2714,16 @@ int systemGetSensorY()
 	return inputGetSensorY();
 }
 
+int systemGetSensorZ()
+{
+	return 0;
+}
+
+u8 systemGetSensorDarkness()
+{
+	//return sensorDarkness;
+}
+
 SoundDriver * systemSoundInit()
 {
 	soundShutdown();

src/sdl/inputSDL.cpp

@@ -619,3 +619,4 @@ EPad inputGetDefaultJoypad()
 {
   return sdlDefaultJoypad;
 }
+