Build libcdd.so and include it as a dependency

Change-Id: Idee6b1954d7354f71344572afe7397c08e8008e7
diff --git a/frc971/control_loops/python/BUILD b/frc971/control_loops/python/BUILD
index b79d676..bb2a754 100644
--- a/frc971/control_loops/python/BUILD
+++ b/frc971/control_loops/python/BUILD
@@ -11,4 +11,7 @@
   deps = [
     '//external:slycot',
   ],
+  data = [
+    '//third_party/cddlib:_cddlib.so',
+  ],
 )