Add warped motion config flag

Change-Id: I4b5e1251dc215073384e168a6f845ae059d6c4f2
diff --git a/configure b/configure
index 2620369..ced8cb2 100755
--- a/configure
+++ b/configure
@@ -288,6 +288,7 @@
     ext_partition_types
     ext_tile
     obmc
+    warped_motion
     entropy
     bidir_pred
 "