Fix build when Fluidsynth is missing or Fluidlite is used

src/audio_midi.cpp

@@ -149,8 +149,10 @@ void MidiDecoder::ChangeFluidsynthSoundfont(StringView sf_path) {
 		return;
 	}
 
+#if defined(HAVE_FLUIDSYNTH) || defined(HAVE_FLUIDLITE)
 	// Was initialized before
 	works.fluidsynth = FluidSynthDecoder::ChangeGlobalSoundfont(sf_path, works.fluidsynth_status);
+#endif
 }
 
 bool MidiDecoder::CheckWildMidi(std::string &status_message) {

src/config_param.h

@@ -39,6 +39,10 @@ namespace {
 		return std::to_string(i);
 	}
 
+	inline std::string ParamValueToString(double d) {
+		return std::to_string(d);
+	}
+
 	inline std::string ParamValueToString(bool b) {
 		return b ? "[ON]" : "[OFF]";
 	}

src/decoder_fluidsynth.cpp

@@ -130,7 +130,7 @@ static bool load_default_sf(std::string& status_message, fluid_synth_t* syn, int
 
 #if FLUIDSYNTH_VERSION_MAJOR >= 2
 	char* default_sf = nullptr;
-	if (fluid_settings_dupstr(global_settings.get(), "synth.default-soundfont", &default_sf) == FLUID_OK) {
+	if (fluid_settings_dupstr(global_settings.get(), "synth.default-soundfont", &default_sf) == 0) {
 		if (default_sf != nullptr && default_sf[0] != '\0') {
 			sf_paths.emplace_back(default_sf);
 		}
@@ -298,7 +298,7 @@ bool FluidSynthDecoder::ChangeGlobalSoundfont(StringView sf_path, std::string& s
 
 	int new_global_id = fluid_synth_sfload(global_synth.get(), ToString(sf_path).c_str(), 1);
 	if (new_global_id != FLUID_FAILED) {
-		assert(fluid_synth_sfunload(global_synth.get(), global_synth_id, 1) == FLUID_OK);
+		assert(fluid_synth_sfunload(global_synth.get(), global_synth_id, 1) == 0);
 		global_synth_id = new_global_id;
 		status_message = fmt::format("Using soundfont {}", sf_path);
 		return true;

src/scene_title.cpp

@@ -92,7 +92,6 @@ void Scene_Title::CreateHelpWindow() {
 	translate_window->SetHelpWindow(help_window.get());
 }
 
-
 void Scene_Title::Continue(SceneType prev_scene) {
 	Main_Data::game_system->ResetSystemGraphic();