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diff: improve is-binary heuristic

check for runeerror, remove broken partial control code
checks.

--- a/sys/src/cmd/diff/diffio.c

+++ b/sys/src/cmd/diff/diffio.c

@@ -130,7 +130,7 @@

 			 * brave new UNICODE world

 			 */

 			cp += chartorune(&r, cp);

-			if (r == 0 || (r > 0x7f && r <= 0xa0)) {

+			if(r == 0 || r == Runeerror){

 				d->binary++;

 				return bp;

 			}