undo accidental submodule commit
diff --git a/third_party/protobuf b/third_party/protobuf
index a1938b2..3470b68 160000
--- a/third_party/protobuf
+++ b/third_party/protobuf
@@ -1 +1 @@
-Subproject commit a1938b2aa9ca86ce7ce50c27ff9737c1008d2a03
+Subproject commit 3470b6895aa659b7559ed678e029a5338e535f14