Fix TQThreadStorage destruction in the main thread

Before that the allocations of TQThreadStorage objects from the main
thread were never destroyed and memory associated with them were never
freed. The second one isn't a huge problem as at that point program is
terminating anyway (but it still makes valgrind complain). The first one
is the bigger issue as destructors might contain some essential external
cleanups like removing temporary files.

Signed-off-by: Alexander Golubev <fatzer2@gmail.com>

 private:
     TQThreadInstance * d;
     friend class TQThreadInstance;
+    friend class TQThreadStorageData;

     {
         // avoid warning from TQThread
         d->running = false;
+	// do some cleanup

     static void finish( TQThreadInstance * );
 #endif // Q_OS_WIN32
 
+    static void finishMain( TQThreadInstance *d );

 
 TQThreadStorageData::~TQThreadStorageData()
 {
+    // Main thread won't be able to cleanup its storage upon exit, so we will do it for them

 public:
     inline TQCoreApplicationThread()
     {
+        tqt_gui_thread_self = this;

+    static TQCoreApplicationThread* tqt_gui_thread_self;
 };
 
+TQCoreApplicationThread* TQCoreApplicationThread::tqt_gui_thread_self = 0;