Bump buidlroot version to 2018.02.6

bsp/buildroot/package/openocd/0002-configure-enable-build-on-uclinux.patch

@@ -0,0 +1,26 @@
+From 11ea78c4d253bb90296e2dd8c3f7fbf59ba397b6 Mon Sep 17 00:00:00 2001
+From: Bernd Kuhls <bernd.kuhls@t-online.de>
+Date: Thu, 17 Aug 2017 06:30:31 +0200
+Subject: [PATCH] configure: enable build on uclinux
+
+Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
+---
+ configure.ac | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/configure.ac b/configure.ac
+index c680bda7..1a7980a0 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -327,7 +327,7 @@ AC_ARG_ENABLE([sysfsgpio],
+   [build_sysfsgpio=$enableval], [build_sysfsgpio=no])
+ 
+ AS_CASE([$host_os],
+-  [linux*], [],
++  [linux*|uclinux*], [],
+   [
+     AS_IF([test "x$build_sysfsgpio" = "xyes"], [
+       AC_MSG_ERROR([sysfsgpio is only available on linux])
+-- 
+2.11.0
+