fix broken git commit in stdarch

diff --git a/library/stdarch b/library/stdarch
index d6822f9c433bd70f786b157f17beaf64ee28d83a..78891cdf292c23278ca8723bd543100249159604 160000 (submodule)
--- a/library/stdarch
+++ b/library/stdarch
@@ -1 +1 @@
-Subproject commit d6822f9c433bd70f786b157f17beaf64ee28d83a
+Subproject commit 78891cdf292c23278ca8723bd543100249159604