Added 'addons' subdirectory to linux addons directory. This allows later

if necessary to have different versions of addons directory (which is what
Windows and Macs already support).
NOTE for linux users: this means that currently installed addons will not
     be found anymore. I would recommend to delete existing files in 
     .local/share/supertuxkart.


git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@8761 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/io/file_manager.cpp

@@ -573,10 +573,18 @@ void FileManager::checkAndCreateAddonsDir()
         }
     }
 
-    const std::string CONFIGDIR("supertuxkart");
-
-    m_addons_dir += "/";
-    m_addons_dir += CONFIGDIR;
+    m_addons_dir += "/supertuxkart":
+    if(!checkAndCreateDirectory(m_config_dir))
+    {
+        // If $HOME/.config can not be created:
+        fprintf(stderr, 
+            "Can't create dir '%s', falling back to use '%s'.\n",
+            m_config_dir.c_str(), getenv("HOME"));
+        m_addons_dir = getenv("HOME");
+        m_addons_dir += ".";
+    }
+    m_addons_dir += "/addons";
+    
 #endif
 
     if(!checkAndCreateDirectory(m_addons_dir))