Fix audio output in espeak-ng when USE_ASYNC is not defined.

src/libespeak-ng/speech.c

 	option_waveout = 1; // inhibit portaudio callback from wavegen.cpp
 	out_samplerate = 0;
 
+#ifdef USE_ASYNC
 	if (output_mode == (ENOUTPUT_MODE_SYNCHRONOUS | ENOUTPUT_MODE_SPEAK_AUDIO)) {
+#else
+	if ((output_mode & ENOUTPUT_MODE_SPEAK_AUDIO) == ENOUTPUT_MODE_SPEAK_AUDIO) {
+#endif
 		option_waveout = 0;
 		WavegenInitSound();
 	}
 
 	SpeakNextClause(NULL, text, 0);
 
+#ifdef USE_ASYNC
 	if (my_mode == (ENOUTPUT_MODE_SYNCHRONOUS | ENOUTPUT_MODE_SPEAK_AUDIO)) {
+#else
+	if ((my_mode & ENOUTPUT_MODE_SPEAK_AUDIO) == ENOUTPUT_MODE_SPEAK_AUDIO) {
+#endif
 		bool continue_speaking = true;
 		while (continue_speaking) {
 #ifdef PLATFORM_WINDOWS