Properly export all lua-facing functions and use those for initialization (love.cpp no longer explicitly mentions implementations)

src/modules/sound/wrap_Decoder.cpp

@@ -57,7 +57,7 @@ namespace sound
 		{ 0, 0 }
 	};
 
-	int luaopen_decoder(lua_State * L)
+	extern "C" int luaopen_decoder(lua_State * L)
 	{
 		return luax_register_type(L, "Decoder", functions);
 	}

src/modules/sound/wrap_Decoder.h

@@ -33,7 +33,7 @@ namespace sound
 	int w_Decoder_getChannels(lua_State * L);
 	int w_Decoder_getBits(lua_State * L);
 	int w_Decoder_getSampleRate(lua_State * L);
-	int luaopen_decoder(lua_State * L);
+	extern "C" int luaopen_decoder(lua_State * L);
 
 } // sound
 } // love

src/modules/sound/wrap_Sound.cpp

@@ -113,7 +113,7 @@ namespace sound
 		0
 	};
 
-	int luaopen_love_sound(lua_State * L)
+	extern "C" int luaopen_love_sound(lua_State * L)
 	{
 		if (instance == 0)
 		{

src/modules/sound/wrap_SoundData.cpp

@@ -83,7 +83,7 @@ namespace sound
 		{ 0, 0 }
 	};
 
-	int luaopen_sounddata(lua_State * L)
+	extern "C" int luaopen_sounddata(lua_State * L)
 	{
 		return luax_register_type(L, "SoundData", functions);
 	}

src/modules/sound/wrap_SoundData.h

@@ -37,7 +37,7 @@ namespace sound
 	int w_getSampleRate(lua_State * L);
 	int w_setSample(lua_State * L);
 	int w_getSample(lua_State * L);
-	int luaopen_sounddata(lua_State * L);
+	extern "C" int luaopen_sounddata(lua_State * L);
 
 } // sound
 } // love