Always send frame size explicitly

This commit changes to send frame size explicitly when
error_resilient_mode=1. Purpose is to allow parsing of bitstream
after a packet loss.

Change-Id: I7d1c010a465aa18914762cc1a3e61db377304c08
diff --git a/configure b/configure
index 611756f..b5f0b2d 100755
--- a/configure
+++ b/configure
@@ -285,6 +285,7 @@
     palette
     daala_ec
     cb4x4
+    frame_size
 "
 CONFIG_LIST="
     dependency_tracking