Remove empty override functions (#14312)

* Remove empty override functions, 0-9

* Remove empty override functions, A-D

* Remove empty override functions, E-H

* Remove empty override functions, handwired

* Remove empty override functions, I-L

* Remove empty override functions, M-P

* Remove empty override functions, Q-T

* Remove empty override functions, U-Z

keyboards/boston_meetup/2019/keymaps/default/keymap.c

@@ -156,10 +156,3 @@ bool music_mask_user(uint16_t keycode) {
       return true;
   }
 }
-
-void matrix_init_user(void) {
-}
-
-
-void matrix_scan_user(void) {
-}