* nfs.h: Make sure packing of NFS fattr3 struct is 4 byte.
	(struct nfs_timestruc_t): Define.
	(struct fattr3): Define timestamps as type struct nfs_timestruc_t.
	* fhandler_disk_file.cc (fhandler_base::fstat_by_nfs_ea): Copy
	each timestruc_t component separately to accommodate different size.