Merge pull request #2449 from shenki/buildroot-2018.08.2

buildroot: Move to 2018.08.2 point release
diff --git a/buildroot b/buildroot
index 4264b62..d5fc953 160000
--- a/buildroot
+++ b/buildroot
@@ -1 +1 @@
-Subproject commit 4264b628212d4d89cde9a69398a8d74d39f105a0
+Subproject commit d5fc953013076b2f440daf32cea1908490701f78