Make rectangular transform block available in the common lib

This prepares the integration of rectangular transform block size
with recursive transform block partition system.

Change-Id: Id96aa3790dace15619c665f438241938992d1730
diff --git a/av1/common/scan.h b/av1/common/scan.h
index af39993..2078e99 100644
--- a/av1/common/scan.h
+++ b/av1/common/scan.h
@@ -27,6 +27,7 @@
 
 extern const SCAN_ORDER av1_default_scan_orders[TX_SIZES];
 extern const SCAN_ORDER av1_intra_scan_orders[TX_SIZES][TX_TYPES];
+extern const SCAN_ORDER av1_inter_scan_orders[TX_SIZES_ALL][TX_TYPES];
 
 #if CONFIG_ADAPT_SCAN
 void av1_update_scan_prob(AV1_COMMON *cm, TX_SIZE tx_size, TX_TYPE tx_type,
@@ -87,7 +88,7 @@
   return &cm->fc->sc[tx_size][tx_type];
 #else  // CONFIG_ADAPT_SCAN
   (void)cm;
-#if CONFIG_EXT_TX
+#if CONFIG_EXT_TX || CONFIG_VAR_TX
   return is_inter ? &av1_inter_scan_orders[tx_size][tx_type]
                   : &av1_intra_scan_orders[tx_size][tx_type];
 #else