Suppress warnings, etc

・Suppress warnings
・Remove unused variable "did_update"

Marlin/Marlin_main.cpp

   float offs = LOGICAL_POSITION(0, axis);
 
   #if ENABLED(DUAL_X_CARRIAGE)
-    bool did_update = false;
     if (axis == X_AXIS) {
 
       // In Dual X mode hotend_offset[X] is T1's home position

Marlin/planner.h

     static void set_position_mm(const AxisEnum axis, const float &v);
     static FORCE_INLINE void set_z_position_mm(const float &z) { set_position_mm(Z_AXIS, z); }
     static FORCE_INLINE void set_e_position_mm(const float &e) {
-      set_position_mm((AxisEnum)E_AXIS
+      set_position_mm(AxisEnum(E_AXIS
         #if ENABLED(DISTINCT_E_FACTORS)
           + active_extruder
         #endif
-      , e);
+      ), e);
     }
 
     /**