fix build error

sw_usb_audio/app_usb_aud_phaten_golden_6ch/src/extensions/dsp.c

@@ -92,6 +92,7 @@ unsigned g_mute_on_off_t0 = MUTE_OFF;
 
 unsigned g_game_mode = 0;
 
+#if USE_EX3D == 1
 static void ex3d_apply_boot_angles(void)
 {
     int apply_count = (NUM_USB_CHAN_OUT < 8) ? NUM_USB_CHAN_OUT : 8;
@@ -103,6 +104,7 @@ static void ex3d_apply_boot_angles(void)
         debug_printf("ex3d_apply_boot_angles: %d, %d\n", EX3D_VAngle[i], EX3D_HAngle[i]);
     }
 }
+#endif
 
 // On UserBufferManagement Tile (1)
 static unsigned frame_index = 0;
@@ -1007,6 +1009,8 @@ void hid_button_task(chanend_t cc_mic_level, chanend_t c_hidRcvData, chanend_t c
                 for (int i = 0; i < 8; ++i) {
                     incoming_angles[i] = chan_in_word(cc_mic_level);
                 }
+
+#if USE_EX3D == 1
                 if (g_runtime_angle_written) {
                     // 改动原因：主机运行期已写入角度时，0xF9可能携带启动早期flash旧值；此处只消费通道数据但不覆盖当前角度。
                     debug_printf("Boot sync ex3d angles ignored (runtime angle already written)\n");
@@ -1023,6 +1027,7 @@ void hid_button_task(chanend_t cc_mic_level, chanend_t c_hidRcvData, chanend_t c
                     }
                     debug_printf("Boot sync ex3d angles loaded\n");
                 }
+#endif
             }
         }
         continue;