chans and maps of interfaces

R=r
DELTA=746  (729 added, 1 deleted, 16 changed)
OCL=20858
CL=20858
diff --git a/src/runtime/runtime.h b/src/runtime/runtime.h
index dea47f7..b2395e2 100644
--- a/src/runtime/runtime.h
+++ b/src/runtime/runtime.h
@@ -220,7 +220,7 @@
 /*
  * external data
  */
-extern	Alg	algarray[3];
+extern	Alg	algarray[4];
 extern	string	emptystring;
 G*	allg;
 int32	goidgen;