Added missing system libraries and headers for bazel.

Change-Id: I966d28dd5a6677acc73c608a89efa30f8358b0dd
diff --git a/aos/common/controls/BUILD b/aos/common/controls/BUILD
index 6c0805c..5c9ed5c 100644
--- a/aos/common/controls/BUILD
+++ b/aos/common/controls/BUILD
@@ -31,6 +31,9 @@
 
 cc_library(
   name = 'polytope',
+  hdrs = [
+    'polytope.h',
+  ],
   deps = [
     '//third_party/eigen',
     '//third_party/cddlib',