buildroot: Move to 2018.08.2 point release

No package changes.

 http://lists.busybox.net/pipermail/buildroot/2018-October/234252.html
 https://git.buildroot.net/buildroot/plain/CHANGES?id=2018.08.2

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/buildroot b/buildroot
index 4264b62..d5fc953 160000
--- a/buildroot
+++ b/buildroot
@@ -1 +1 @@
-Subproject commit 4264b628212d4d89cde9a69398a8d74d39f105a0
+Subproject commit d5fc953013076b2f440daf32cea1908490701f78