* path.cc (close_user_proc_parms_cwd_handle): Remove.

	* path.cc (close_user_proc_parms_cwd_handle): Remove.
	(cwdstuff::init): Don't call close_user_proc_parms_cwd_handle.
	Call set to set cwd with all-sharing handle.
	(cwdstuff::set): Fix comment.  Don't close cwd handle.  Set in
	user parameter block instead and close old cwd handle.
	* syscalls.cc (rename): Call unlink_nt instead of RemoveDirectory or
	DeleteFile to allow deleting shared files/directories.