buildroot: Move to 2019.02.2 stable release

Upstream release notes:

 https://git.buildroot.net/buildroot/plain/CHANGES?id=2019.02.2
 http://lists.busybox.net/pipermail/buildroot/2019-April/248972.html

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/buildroot b/buildroot
index e01dcd0..93b841d 160000
--- a/buildroot
+++ b/buildroot
@@ -1 +1 @@
-Subproject commit e01dcd0974861a2c26eed6a66829a2d0bc5356d7
+Subproject commit 93b841d204015104b688f865c05234d69b524e9f