Omit unused UBL motion code

Marlin/src/feature/bedlevel/ubl/ubl.h

@@ -321,8 +321,11 @@ class unified_bed_leveling {
       return i < GRID_MAX_POINTS_Y ? pgm_read_float(&_mesh_index_to_ypos[i]) : MESH_MIN_Y + i * (MESH_Y_DIST);
     }
 
-    static void line_to_destination_cartesian(const float &fr, const uint8_t e);
+    #if UBL_SEGMENTED
       static bool prepare_segmented_line_to(const float (&rtarget)[XYZE], const float &feedrate);
+    #else
+      static void line_to_destination_cartesian(const float &fr, const uint8_t e);
+    #endif
 
     #define _CMPZ(a,b) (z_values[a][b] == z_values[a][b+1])
     #define CMPZ(a) (_CMPZ(a, 0) && _CMPZ(a, 1))

Marlin/src/feature/bedlevel/ubl/ubl_motion.cpp

@@ -41,6 +41,8 @@
     extern void set_current_from_destination();
   #endif
 
+#if !UBL_SEGMENTED
+
   void unified_bed_leveling::line_to_destination_cartesian(const float &feed_rate, const uint8_t extruder) {
     /**
      * Much of the nozzle movement will be within the same cell. So we will do as little computation
@@ -405,7 +407,7 @@
     set_current_from_destination();
   }
 
-  #if UBL_SEGMENTED
+#else // UBL_SEGMENTED
 
     #if IS_SCARA // scale the feed rate from mm/s to degrees/s
       static float scara_feed_factor, scara_oldA, scara_oldB;