Fix to compare thread_id with `pthread_equal()`

`pthread_t` is an opaque type, should not be compared with `==`.

Signed-off-by: OBATA Akio <obache@wizdas.com>
(cherry picked from commit 9ae164eb83)

src/kernel/qthread_unix.cpp

@@ -483,7 +483,7 @@ bool TQThread::wait( unsigned long time )
 {
     TQMutexLocker locker( d->mutex() );
 
-    if ( d->thread_id == pthread_self() ) {
+    if ( pthread_equal( d->thread_id, pthread_self() ) ) {
 #ifdef QT_CHECK_STATE
 	tqWarning( "TQThread::wait: thread tried to wait on itself" );
 #endif // QT_CHECK_STATE