Remove some files that old, unused, unneeded.

	deleted:  support/export/keys.c
	deleted:  support/include/rpcdispatch.h
	deleted:  support/include/rpcsec.h
	deleted:  support/include/version.h
	deleted:  support/include/ypupdate.h
	deleted:  support/nfs/clients.c
	deleted:  support/nfs/keytab.c
	deleted:  support/nfs/ypupdate_xdr.c
	deleted:  support/rpc/include/Makefile.am
	deleted:  tools/rpcdebug/neat_idea.c
	deleted:  utils/mountd/mount_xdr.c
	deleted:  utils/rquotad/pathnames.h