Bump buildroot to 2019.02

bsp/buildroot/package/capnproto/0001-Do-not-use-execinfo-h-with-uclibc.patch

@@ -0,0 +1,30 @@
+From e651ac5febc59e3e2b5d3365ededbe5362756da2 Mon Sep 17 00:00:00 2001
+From: Koen Martens <gmc@sonologic.nl>
+Date: Wed, 12 Jul 2017 18:49:32 +0200
+Subject: [PATCH] Do not use execinfo.h with uclibc (#511)
+
+Upstream commit: https://github.com/capnproto/capnproto/commit/e651ac5febc59e3e2b5d3365ededbe5362756da2
+
+Signed-off-by: Koen Martens <gmc@sonologic.nl>
+Signed-off-by: Joel Carlson <JoelsonCarl@gmail.com>
+
+---
+ c++/src/kj/exception.c++ | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/c++/src/kj/exception.c++ b/c++/src/kj/exception.c++
+index 218f1db..339601a 100644
+--- a/c++/src/kj/exception.c++
++++ b/c++/src/kj/exception.c++
+@@ -33,7 +33,7 @@
+ #endif
+ #include "io.h"
+ 
+-#if (__linux__ && __GLIBC__) || __APPLE__
++#if (__linux__ && __GLIBC__ && !__UCLIBC__) || __APPLE__
+ #define KJ_HAS_BACKTRACE 1
+ #include <execinfo.h>
+ #endif
+-- 
+2.7.4
+