Bump buidlroot version to 2018.02.6

bsp/buildroot/boot/syslinux/0008-efi-wrapper-build-it-with-the-host-toolchain.patch

@@ -0,0 +1,32 @@
+From ca8aaded0c7c3900397029bd9520132b62629308 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Beno=C3=AEt=20Allard?= <benoit.allard@greenbone.net>
+Date: Mon, 12 Jun 2017 14:59:16 +0200
+Subject: [PATCH] efi/wrapper: build it with the host toolchain.
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+The wrapper program is executed on the build machine, so it should be
+built with CC_FOR_BUILD.
+
+Signed-off-by: Benoît Allard <benoit.allard@greenbone.net>
+---
+ efi/Makefile | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/efi/Makefile b/efi/Makefile
+index d5443bd5..d24d16db 100644
+--- a/efi/Makefile
++++ b/efi/Makefile
+@@ -79,7 +79,7 @@ syslinux.so: $(OBJS) $(CORE_OBJS) $(LIB_OBJS)
+ #	cp $^ $@
+ 
+ wrapper: wrapper.c
+-	$(CC) $^ -o $@
++	$(CC_FOR_BUILD) $^ -o $@
+ 
+ #
+ # Build the wrapper app and wrap our .so to produce a .efi
+-- 
+2.13.3
+