code cleanup: do not compile mbrola if not enabled

Makefile.am

 
 all-local: \
 	espeak-ng-data/phontab \
-	dictionaries \
-	mbrola
+	dictionaries
 
 uninstall-hook:
 	rm -rf $(DESTDIR)$(DATADIR)
 	src/libespeak-ng/common.c \
 	src/libespeak-ng/compiledata.c \
 	src/libespeak-ng/compiledict.c \
-	src/libespeak-ng/compilembrola.c \
 	src/libespeak-ng/dictionary.c \
 	src/libespeak-ng/encoding.c \
 	src/libespeak-ng/error.c \
 	src/libespeak-ng/ssml.c \
 	src/libespeak-ng/synthdata.c \
 	src/libespeak-ng/synthesize.c \
-	src/libespeak-ng/synth_mbrola.c \
 	src/libespeak-ng/translate.c \
 	src/libespeak-ng/translateword.c \
 	src/libespeak-ng/tr_languages.c \
 
 if OPT_MBROLA
 AM_CFLAGS  += -DUSE_MBROLA=1
-src_libespeak_ng_la_SOURCES += src/libespeak-ng/mbrowrap.c
+src_libespeak_ng_la_SOURCES += \
+	src/libespeak-ng/mbrowrap.c \
+	src/libespeak-ng/synth_mbrola.c \
+	src/libespeak-ng/compilembrola.c
 endif
 
 if OPT_ASYNC
 
 ##### mbrola:
 
+if OPT_MBROLA
+
 PHSOURCE_MBROLA = \
 	$(wildcard phsource/mbrola/*)
 
 	ESPEAK_DATA_PATH=$(CURDIR) src/espeak-ng --compile-mbrola=phsource/mbrola/$*
 
 EXTRA_DIST += $(PHSOURCE_MBROLA)
+
+all-local: mbrola
+
+endif

src/espeak-ng.c

     "\t   Compile pronunciation rules and dictionary from the current\n"
     "\t   directory, including line numbers for use with -X.\n"
     "\t   <voice name> specifies the language\n"
+#if USE_MBROLA
     "--compile-mbrola=<voice name>\n"
     "\t   Compile an MBROLA voice\n"
+#endif
     "--compile-intonations\n"
     "\t   Compile the intonation data\n"
     "--compile-phonemes=<phsource-dir>\n"
 		{ "version", no_argument,       0, 0x10b },
 		{ "sep",     optional_argument, 0, 0x10c },
 		{ "tie",     optional_argument, 0, 0x10d },
+#if USE_MBROLA
 		{ "compile-mbrola", optional_argument, 0, 0x10e },
+#endif
 		{ "compile-intonations", no_argument, 0, 0x10f },
 		{ "compile-phonemes", optional_argument, 0, 0x110 },
 		{ "load",    no_argument,       0, 0x111 },
 			if (phonemes_separator == 'z')
 				phonemes_separator = 0x200d; // ZWJ
 			break;
+#if USE_MBROLA
 		case 0x10e: // --compile-mbrola
 		{
 			espeak_ng_InitializePath(data_path);
 			}
 			return EXIT_SUCCESS;
 		}
+#endif
 		case 0x10f: // --compile-intonations
 		{
 			espeak_ng_InitializePath(data_path);

src/libespeak-ng/speech.c

 	ep->text_position = char_position & 0xffffff;
 	ep->length = char_position >> 24;
 
+#if !USE_MBROLA
+	static const int mbrola_delay = 0;
+#endif
+
 	time = ((double)(count_samples + mbrola_delay + (out_ptr - out_start)/2)*1000.0)/samplerate;
 	ep->audio_position = (int)time;
 	ep->sample = (count_samples + mbrola_delay + (out_ptr - out_start)/2);

src/libespeak-ng/synthdata.c

 		{
 		case 1: // PreVoicing
 			return control & 1;
+#if USE_KLATT
 		case 2: // KlattSynth
 			return voice->klattv[0] != 0;
+#endif
+#if USE_MBROLA
 		case 3: // MbrolaSynth
 			return mbrola_name[0] != 0;
+#endif
 		}
 	}
 	return false;

src/libespeak-ng/synthesize.c

 	if (option_phoneme_events & espeakINITIALIZE_PHONEME_IPA)
 		use_ipa = 1;
 
+#if USE_MBROLA
 	if (mbrola_name[0] != 0)
 		return MbrolaGenerate(phoneme_list, n_ph, resume);
+#endif
 
 	if (resume == false) {
 		ix = 1;

src/libespeak-ng/voices.c

 
 	if (tone_only == 0) {
 		n_replace_phonemes = 0;
+#if USE_MBROLA
 		LoadMbrolaTable(NULL, NULL, 0);
+#endif
 	}
 
 // probably unnecessary, but removing this would break tests
                 sscanf(p, "%d", &voice->speed_percent);
                 SetSpeed(3);
                 break;
+#if USE_MBROLA
             case V_MBROLA:
             {
                 int srate = 16000;
                     voice->samplerate = srate;
             }
                 break;
+#endif
+#if USE_KLATT
             case V_KLATT:
                 voice->klattv[0] = 1; // default source: IMPULSIVE
                 Read8Numbers(p, voice->klattv);
                 voice->klattv[KLATT_Kopen] -= 40;
                 break;
+#endif
             case V_FAST:
                 sscanf(p, "%d", &speed.fast_settings);
                 SetSpeed(3);

src/libespeak-ng/wavegen.c

 	}
 #endif
 
+#if USE_MBROLA
 	if (mbrola_name[0] != 0)
 		MbrolaReset();
+#endif
 }
 
 int WcmdqFree()