Used external roborio compiler instead of local compiler.

Change-Id: Ifec0d68b0b51a822c906bc4f52320004ee2f5d84
diff --git a/y2014/control_loops/shooter/BUILD b/y2014/control_loops/shooter/BUILD
index 8013afc..f04a02a 100644
--- a/y2014/control_loops/shooter/BUILD
+++ b/y2014/control_loops/shooter/BUILD
@@ -43,7 +43,7 @@
     '//y2014:constants',
     '//frc971/control_loops:state_feedback_loop',
     '//aos/common/logging:queue_logging',
-    '//external:libm',
+    '//debian:libm',
   ],
 )