Running global_calibration updates constants.cc.

Change-Id: I1663987d6906f7899a90a95d694bd1db825afeef
diff --git a/y2019/vision/BUILD b/y2019/vision/BUILD
index bdef187..7300850 100644
--- a/y2019/vision/BUILD
+++ b/y2019/vision/BUILD
@@ -90,7 +90,7 @@
 
 cc_binary(
     name = "global_calibration",
-    srcs = ["global_calibration.cc"],
+    srcs = ["global_calibration.cc", "constants_formatting.cc"],
     deps = [
          ":target_finder",
          "//aos/logging",