Update to a newer toolchain

Change-Id: I1194db480e3b6fb1f726597b1b572a5f8a94063d
diff --git a/submodules/buildroot b/submodules/buildroot
index 4362720..83b5ba3 160000
--- a/submodules/buildroot
+++ b/submodules/buildroot
@@ -1 +1 @@
-Subproject commit 4362720dd0e004a9b387c7308daa39c0a9d3635e
+Subproject commit 83b5ba3c200b87da3623c20065ee89938938bfdd