Merge pull request #2239 from shenki/buildroot-stable-bump

Buildroot updates
diff --git a/buildroot b/buildroot
index 378a934..9f5057f 160000
--- a/buildroot
+++ b/buildroot
@@ -1 +1 @@
-Subproject commit 378a934e263c91ed41852818454c0d54e680658b
+Subproject commit 9f5057fa33f6b72c4bb919d7116715f7abbb5ec2