Support multiple joystick buttons bound to the same gamepad button

(cherry picked from commit ed94331)

Author: slouken

src/joystick/SDL_gamecontroller.c

@@ -2364,23 +2364,19 @@ Uint8 SDL_GameControllerGetButton(SDL_GameController *gamecontroller, SDL_GameCo
                     if (binding->input.axis.axis_min < binding->input.axis.axis_max) {
                         valid_input_range = (value >= binding->input.axis.axis_min && value <= binding->input.axis.axis_max);
                         if (valid_input_range) {
-                            retval = (value >= threshold) ? SDL_PRESSED : SDL_RELEASED;
-                            break;
+                            retval |= (value >= threshold) ? SDL_PRESSED : SDL_RELEASED;
                         }
                     } else {
                         valid_input_range = (value >= binding->input.axis.axis_max && value <= binding->input.axis.axis_min);
                         if (valid_input_range) {
-                            retval = (value <= threshold) ? SDL_PRESSED : SDL_RELEASED;
-                            break;
+                            retval |= (value <= threshold) ? SDL_PRESSED : SDL_RELEASED;
                         }
                     }
                 } else if (binding->inputType == SDL_CONTROLLER_BINDTYPE_BUTTON) {
-                    retval = SDL_JoystickGetButton(gamecontroller->joystick, binding->input.button);
-                    break;
+                    retval |= SDL_JoystickGetButton(gamecontroller->joystick, binding->input.button);
                 } else if (binding->inputType == SDL_CONTROLLER_BINDTYPE_HAT) {
                     int hat_mask = SDL_JoystickGetHat(gamecontroller->joystick, binding->input.hat.hat);
-                    retval = (hat_mask & binding->input.hat.hat_mask) ? SDL_PRESSED : SDL_RELEASED;
-                    break;
+                    retval |= (hat_mask & binding->input.hat.hat_mask) ? SDL_PRESSED : SDL_RELEASED;
                 }
             }
         }