Bump buidlroot version to 2018.02.6

bsp/buildroot/package/libkcapi/0002-Do-not-compile-unused-functions.patch

@@ -0,0 +1,35 @@
+From 217b154a5f65d46064ceb69ce69664105e703a74 Mon Sep 17 00:00:00 2001
+From: Stephan Mueller <smueller@chronox.de>
+Date: Thu, 3 Aug 2017 17:52:48 +0200
+Subject: [PATCH] Do not compile unused functions
+
+GCC 7 now rightfully complains about unused functions.
+
+Signed-off-by: Stephan Mueller <smueller@chronox.de>
+
+[Upstream commit: https://github.com/smuellerDD/libkcapi/commit/217b154a5f65d46064ceb69ce69664105e703a74]
+Signed-off-by: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
+---
+ apps/kcapi-rng.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/apps/kcapi-rng.c b/apps/kcapi-rng.c
+index df7decf..e15edf9 100644
+--- a/apps/kcapi-rng.c
++++ b/apps/kcapi-rng.c
+@@ -45,6 +45,7 @@ struct kcapi_handle *rng = NULL;
+ unsigned int Verbosity = 0;
+ char *rng_name = NULL;
+ 
++#ifndef HAVE_GETRANDOM
+ static int read_complete(int fd, uint8_t *buf, uint32_t buflen)
+ {
+ 	ssize_t ret;
+@@ -76,6 +77,7 @@ static int read_random(uint8_t *buf, uint32_t buflen)
+ 	close(fd);
+ 	return ret;
+ }
++#endif
+ 
+ static int get_random(uint8_t *buf, uint32_t buflen)
+ {