Use --enable-daala_ec by default.

Change-Id: I9e2a8db4e59cb9c109e978e473749ebc4e910148

configure

diff --git a/configure b/configure
index c331b26..75a8844 100755
--- a/configure
+++ b/configure
@@ -458,6 +458,9 @@
         enabled ${c} && enable_feature ${c##*_}s
     done
 
+    # Enable daala_ec by default
+    ! enabled ans && soft_enable daala_ec
+
     # Fix up experiment dependencies
     enabled ec_adapt && enable_feature ec_multisymbol
     enabled ec_multisymbol && ! enabled ans && soft_enable daala_ec