Add jnt_comp experimental flag

Change-Id: Icdce2ac2203bacdcbbbf17d1fc3308dc1ed15974
diff --git a/configure b/configure
index 87644a4..73ba163 100755
--- a/configure
+++ b/configure
@@ -343,6 +343,7 @@
     hash_me
     colorspace_headers
     mfmv
+    jnt_comp
 "
 CONFIG_LIST="
     dependency_tracking