Fix crash in hexchat_pluginpref_list()

Set max output size to 4096

plugins/python/python.c

@@ -1959,7 +1959,7 @@ Module_hexchat_pluginpref_list(PyObject *self, PyObject *args)
 {
 	PluginObject *plugin = (PluginObject*)Plugin_GetCurrent();
 	hexchat_plugin *prefph = Plugin_GetHandle(plugin);
-	char list[512];
+	char list[4096];
 	char* token;
 	int result;
 	PyObject *pylist;

src/common/plugin.c

@@ -2015,8 +2015,8 @@ hexchat_pluginpref_list (hexchat_plugin *pl, char* dest)
 		while (fscanf (fpIn, " %[^\n]", bufp) != EOF)	/* read whole lines including whitespaces */
 		{
 			token = strtok (buffer, "=");
-			strncat (dest, token, strlen (token) - 1);
-			strcat (dest, ",");
+			g_strlcat (dest, token, 4096); /* Dest must not be smaller than this */
+			g_strlcat (dest, ",", 4096);
 		}
 
 		fclose (fpIn);