Fix configure issue with unit test add. 

Change-Id: I960c6eb81f8d76c958e8af989700447f581a8812
diff --git a/configure b/configure
index d6ceb4d..6717174 100755
--- a/configure
+++ b/configure
@@ -310,6 +310,7 @@
     small
     postproc_visualizer
     unit_tests
+    experimental
 "
 
 process_cmdline() {