Bump buidlroot version to 2018.02.6

bsp/buildroot/package/efibootmgr/0001-Allow-build-with-uClibc.patch

@@ -1,40 +0,0 @@
-From bbfcc60497c326576bb23cb01d90115ef3cf6947 Mon Sep 17 00:00:00 2001
-From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
-Date: Fri, 25 Nov 2016 20:26:52 +0200
-Subject: [PATCH] Remove unneeded <uchar.h> include
-
-This fixes the build with uClibc.
-
-Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
----
- src/efibootdump.c | 1 -
- src/eficonman.c   | 1 -
- 2 files changed, 2 deletions(-)
-
-diff --git a/src/efibootdump.c b/src/efibootdump.c
-index 6ff8360..7c5a1c5 100644
---- a/src/efibootdump.c
-+++ b/src/efibootdump.c
-@@ -19,7 +19,6 @@
- #include <stdint.h>
- #include <stdio.h>
- #include <stdlib.h>
--#include <uchar.h>
- #include <unistd.h>
- 
- #include "error.h"
-diff --git a/src/eficonman.c b/src/eficonman.c
-index 2c2be38..9bfae79 100644
---- a/src/eficonman.c
-+++ b/src/eficonman.c
-@@ -17,7 +17,6 @@
- #include <stdint.h>
- #include <stdio.h>
- #include <stdlib.h>
--#include <uchar.h>
- #include <unistd.h>
- 
- #define  _(String) gettext (String)
--- 
-2.10.2
-