Throughout, use FileBothDirectoryInformation info class rather than

	FileDirectoryInformation info class to avoid problems with incomplete
	filesystem implementations.  Fix comments accordingly.
	* fhandler_disk_file.cc (fhandler_disk_file::readdir_helper): Set
	fname->Length to 0 in error case to avoid potential crash in debug
	output.
	(fhandler_disk_file::readdir): Try to speed up the working default case.
	Check for STATUS_INVALID_NETWORK_RESPONSE as potential status value
	returned by filesystems not implementing FileIdBothDirectoryInformation.
	* ntdll.h (STATUS_INVALID_NETWORK_RESPONSE): Define.
	(FILE_BOTH_DIRECTORY_INFORMATION): Rename to official name.
	* path.cc (symlink_info::check): Don't request FILE_READ_EA access, it's
	not required for NFS.  Try to speed up the working default case.  Check
	for STATUS_INVALID_NETWORK_RESPONSE as potential status value returned
	by filesystems not supporting non-NULL EA parameters.  Fix the way
	fs.update is called.  Improve debug output.

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