Missed some variable declarations

Integrated fixes from henrikbrixandersen pull request #504

Marlin/Marlin_main.cpp

@@ -177,6 +177,10 @@ float extruder_offset[2][EXTRUDERS] = {
 #endif
 uint8_t active_extruder = 0;
 int fanSpeed=0;
+#ifdef SERVO_ENDSTOPS
+  int servo_endstops[] = SERVO_ENDSTOPS;
+  int servo_endstop_angles[] = SERVO_ENDSTOP_ANGLES;
+#endif
 #ifdef BARICUDA
 int ValvePressure=0;
 int EtoPPressure=0;

Marlin/Servo.cpp

@@ -41,6 +41,8 @@
  detach()    - Stops an attached servos from pulsing its i/o pin.
 
 */
+#include "Configuration.h" 
+
 #ifdef NUM_SERVOS
 #include <avr/interrupt.h>
 #include <Arduino.h>

Marlin/pins.h

@@ -391,7 +391,7 @@
       #define SERVO2_PIN         5
     #endif
 
-    #if NUM_SERVOS > 2
+    #if NUM_SERVOS > 3
       #define SERVO3_PIN         4
     #endif
   #endif