Probe cycle line numbers ifdef fixes to get it to compile.

- Updated some of the ifdefs when disabling line numbers feature.
Getting messy with this compile-time option. This will likely get
cleaned up later.

- This is just a push to get the new probing code to compile. Testing
and optimization of the code will soon follow and be pushed next.

motion_control.h

@@ -54,7 +54,11 @@ void mc_homing_cycle();
 // Perform tool length probe cycle. Requires probe switch.
 // Returns STATUS_OK in all cases except when the motion is completed without the probe being triggered.
 // In that case, it returns a STATUS_PROBE_ERROR
+#ifdef USE_LINE_NUMBERS
 uint8_t mc_probe_cycle(float *target, float feed_rate, uint8_t invert_feed_rate, int32_t line_number);
+#else
+uint8_t mc_probe_cycle(float *target, float feed_rate, uint8_t invert_feed_rate);
+#endif
 
 // Performs system reset. If in motion state, kills all motion and sets system alarm.
 void mc_reset();