Revert "issue 172: fix sluggish speech for stopped speech."

This reverts commit f9ab812e00.

src/libespeak-ng/fifo.c

 			status = a_status;
 
 		if (a_stop_is_required) {
-			// stop the audio early, to be more responsive when using eSpeak NG
-			// for audio.
-			close_audio();
-
 			// acknowledge the stop request
 			if((a_status = pthread_mutex_lock(&my_mutex)) != ENS_OK)
 				return a_status;

src/libespeak-ng/speech.c

 char path_home[N_PATH_HOME]; // this is the espeak-ng-data directory
 extern int saved_parameters[N_SPEECH_PARAM]; // Parameters saved on synthesis start
 
-void close_audio(void)
-{
-#ifdef HAVE_PCAUDIOLIB_AUDIO_H
-	if ((my_mode & ENOUTPUT_MODE_SPEAK_AUDIO) == ENOUTPUT_MODE_SPEAK_AUDIO) {
-		audio_object_close(my_audio);
-	}
-#endif
-}
-
 static int dispatch_audio(short *outbuf, int length, espeak_EVENT *event)
 {
 	int a_wave_can_be_played = 1;

src/libespeak-ng/speech.h

 } MNEM_TAB;
 int LookupMnem(MNEM_TAB *table, const char *string);
 
-void close_audio(void);
-
 extern char path_home[N_PATH_HOME];    // this is the espeak-ng-data directory
 
 extern ESPEAK_NG_API void strncpy0(char *to, const char *from, int size);