Bring configs up to date

Marlin/src/config/examples/Sanguinololu/Configuration_adv.h

@@ -222,6 +222,17 @@
 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
 /**
  * M355 Case Light on-off / brightness
  */