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9660srv: go back to 128k clusters

doing tests taring up 9front.iso shows the following:

lowering the cluster size back to 128k avoids over half the
reads. 837888 sectors read for 512k vs. 347712 sectors with
128k cluster size.

--- a/sys/src/cmd/9660srv/iobuf.c

+++ b/sys/src/cmd/9660srv/iobuf.c

@@ -23,9 +23,8 @@

  * it's worth worrying about.		-rsc

  */

-/* trying a larger value to get greater throughput - geoff */

-#define	BUFPERCLUST	256 /* sectors/cluster; was 64, 64*Sectorsize = 128kb */

-#define	NCLUST		16

+#define	BUFPERCLUST	64 /* sectors/cluster; 64*Sectorsize = 128kb */

+#define	NCLUST		64

 int nclust = NCLUST;