Apply patch by marius1309 to fix #939, thanks\!

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@12688 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/io/file_manager.cpp

@@ -980,7 +980,8 @@ void FileManager::listFiles(std::set<std::string>& result,
  */
 void FileManager::checkAndCreateDirForAddons(const std::string &dir)
 {
-    bool success = checkAndCreateDirectory(dir);
+    // Tries to create directory recursively
+    bool success = checkAndCreateDirectoryP(dir);
     if(!success)
     {
         Log::warn("FileManager", "There is a problem with the addons dir.");