Fix build for gcc 4.4 under mingw

   At least gcc 4.4.7 under mingw failed here with
   cc1plus.exe: error: candidates are: #'tree_list' not
   supported by dump_decl#<declaration error>

   I think this is because in the Namespace Nepomuk2
   Query is also a namespace. Explicitly naming the
   type fixed this.

services/storage/query/folder.cpp

@@ -104,7 +104,7 @@ namespace {
         }
     }
 
-    void intiWatcherForQuery(ResourceWatcher* watcher, const Query::Query& query) {
+    void intiWatcherForQuery(ResourceWatcher* watcher, const Nepomuk2::Query::Query& query) {
         // The empty property is for comparison terms which do not have a property
         // in that case we want to monitor all properties
         bool emptyProperty = false;