An installer was failing when trying to create subkeys after denying
delete access to their parent key.

kernel32/tests: Repeat test for SignalObjectAndWait multiple times to test wineserver wakeup cookie management.

The code for SELECT_SIGNAL_AND_WAIT in select_on() calls signal_object(). This might
wake up the same thread which is currently in the wineserver call. The value for
current->wait->cookie is initialized at the end of the function, and not defined yet
at this point.