* ntdll.h (NtNotifyChangeDirectoryFile): Declare.

	* ntdll.h (NtNotifyChangeDirectoryFile): Declare.
	(NtQueryAttributesFile): Move to maintain alphabetical order of
	declarations.  Add comment to note that timestamp information returned
	by NtQueryAttributesFile is unreliable.
	* path.h (etc::changed_h): Move here.
	(etc::fn): Change type to OBJECT_ATTRIBUTES.
	(etc::last_modified): Change type to LARGE_INTEGER.
	(etc::init): Take PUNICODE_STRING as second argument.
	* path.cc: Accomodate above changes.
	(etc::test_file_change): Use NT native functions.
	(etc::dir_changed): Ditto.
	* uinfo.cc (pwdgrp::load): Call etc::init with NT native path.