auhal: packet.c is no longer needed

modules/audio_output/Modules.am

 SOURCES_waveout = waveout.c windows_audio_common.h
-SOURCES_auhal = TPCircularBuffer.h TPCircularBuffer.c auhal.c packet.c
+SOURCES_auhal = TPCircularBuffer.h TPCircularBuffer.c auhal.c
 SOURCES_audioqueue = audioqueue.c
 
 libopensles_android_plugin_la_SOURCES = opensles_android.c

modules/audio_output/auhal.c

@@ -69,7 +69,6 @@
  *****************************************************************************/
 struct aout_sys_t
 {
-    aout_packet_t               packet;
     AudioObjectID               i_default_dev;      /* DeviceID of defaultOutputDevice */
     AudioObjectID               i_selected_dev;     /* DeviceID of the selected device */
     bool                        b_selected_dev_is_digital;