Revert r250565 which causes issues for older CPUs

PR:		conf/178504
Requested by:	many
Add support for the eofflag to nfs_readdir() in the new NFS
client so that it works under a unionfs mount.

Submitted by:	Jared Yanovich (slovichon@gmail.com)
Reviewed by:	kib
MFC after:	2 weeks