* autoload.cc (CloseDesktop): Define.

	* autoload.cc (CloseDesktop): Define.
	(CreateDesktopA): Define.
	(SetThreadDesktop): Define.
	* spawn.cc (spawn_guts): When starting a process under another user
	account, don't open up permissions on current window station and
	desktop.  Instead, if not in interactive session, create a new per-user
	window station plus default desktop and use that for the child process.