remove experiment allowing empty structures

Reference: /n/atom/patch/applied2013/ccacidvoid
Date: Wed Jun 19 03:16:06 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/cc/acid.c	Wed Jun 19 03:15:52 2013
+++ /sys/src/cmd/cc/acid.c	Wed Jun 19 03:15:52 2013
@@ -112,9 +112,6 @@
 		Bprint(&outbuf, "	T%d\n", t->etype);
 		break;
 
-	case TVOID:
-		break;		/* relies on acid being able to handle empty aggrs. */
-
 	case TIND:
 		if(s == S)
 			break;