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

src/modules/filesystem/physfs/wrap_File.cpp

@@ -204,7 +204,7 @@ namespace physfs
 			{ 0, 0 }
 	};
 
-	int luaopen_file(lua_State * L)
+	extern "C" int luaopen_file(lua_State * L)
 	{
 		return luax_register_type(L, "File", functions);
 	}

src/modules/filesystem/physfs/wrap_File.h

@@ -42,7 +42,7 @@ namespace physfs
 	int w_File_tell(lua_State * L);
 	int w_File_seek(lua_State * L);
 	int w_File_lines(lua_State * L);
-	int luaopen_file(lua_State * L);
+	extern "C" int luaopen_file(lua_State * L);
 } // physfs
 } // filesystem
 } // love

src/modules/filesystem/physfs/wrap_FileData.cpp

@@ -59,7 +59,7 @@ namespace physfs
 		{ 0, 0 }
 	};
 
-	int luaopen_filedata(lua_State * L)
+	extern "C" int luaopen_filedata(lua_State * L)
 	{
 		return luax_register_type(L, "FileData", w_FileData_functions);
 	}

src/modules/filesystem/physfs/wrap_FileData.h

@@ -35,7 +35,7 @@ namespace physfs
 	FileData * luax_checkfiledata(lua_State * L, int idx);
 	int w_FileData_getFilename(lua_State * L);
 	int w_FileData_getExtension(lua_State * L);
-	int luaopen_filedata(lua_State * L);
+	extern "C" int luaopen_filedata(lua_State * L);
 } // physfs
 } // filesystem
 } // love

src/modules/filesystem/physfs/wrap_Filesystem.cpp

@@ -383,7 +383,7 @@ namespace physfs
 		0
 	};
 
-	int luaopen_love_filesystem(lua_State * L)
+	extern "C" int luaopen_love_filesystem(lua_State * L)
 	{
 		if (instance == 0)
 		{