Remove old shared memory queue

We can't quite kill shared memory, but we can kill the queue.  There are
no more users.

Change-Id: I8c3ab008ab31a51cbcccf12ce89a268aed304473
diff --git a/frc971/control_loops/drivetrain/BUILD b/frc971/control_loops/drivetrain/BUILD
index ffa2c11..2e357c7 100644
--- a/frc971/control_loops/drivetrain/BUILD
+++ b/frc971/control_loops/drivetrain/BUILD
@@ -223,6 +223,7 @@
         ":drivetrain_status_fbs",
         ":spline",
         ":trajectory",
+        "//aos:condition",
         "//aos:init",
         "//aos/util:math",
         "//frc971/control_loops:control_loops_fbs",