Move some initialisation code from the old espeakedit.cpp file into espeak_ng_CompilePhonemeData to fix the phoneme data.

src/libespeak-ng/compiledata.c

 espeak_ng_STATUS espeak_ng_CompilePhonemeData(long rate, FILE *log, espeak_ng_ERROR_CONTEXT *context)
 {
 	if (!log) log = stderr;
+
+	samplerate_native = samplerate = rate;
+	LoadPhData(NULL, NULL);
+	if (LoadVoice("", 0) == NULL)
+		return ENS_VOICE_NOT_FOUND;
+
 	WavegenInit(rate, 0);
 	WavegenSetVoice(voice);
 	return CompilePhonemeData2("phonemes", log, context);