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acme: avoid division by zero when resizing col (#189)

To reproduce, create a column with at least two windows and resize
acme to have almost zero height.

(imported from plan9port commit 76b9347a5fa3a0970527c6ee1b97ef1c714f636b)

--- a/sys/src/cmd/acme/cols.c

+++ b/sys/src/cmd/acme/cols.c

@@ -197,8 +197,11 @@

 		w->maxlines = 0;

 		if(i == c->nw-1)

 			r1.max.y = r.max.y;

-		else

-			r1.max.y = r1.min.y+(Dy(w->r)+Border)*Dy(r)/Dy(c->r);

+		else {

+			r1.max.y = r1.min.y;

+			if(Dy(c->r) != 0)

+				r1.max.y += (Dy(w->r)+Border)*Dy(r)/Dy(c->r);

+		}

 		r2 = r1;

 		r2.max.y = r2.min.y+Border;

 		draw(screen, r2, display->black, nil, ZP);