Update rust submodule.

diff --git a/src/ext/rust b/src/ext/rust
index a870933f6b20fc9c47a13e9d980d56b49e30ddb5..e92c124a41535bd2131b9506a7d95c68c9d8feda 160000 (submodule)
--- a/src/ext/rust
+++ b/src/ext/rust
@@ -1 +1 @@
-Subproject commit a870933f6b20fc9c47a13e9d980d56b49e30ddb5
+Subproject commit e92c124a41535bd2131b9506a7d95c68c9d8feda