Bump buidlroot version to 2018.02.6

bsp/buildroot/package/cjson/Config.in

@@ -1,7 +1,7 @@
 config BR2_PACKAGE_CJSON
 	bool "cJSON"
 	help
-	  An ultra-lightweight, portable, single-file, simple-as-can-be ANSI-C
-	  compliant JSON parser, under MIT license.
+	  An ultra-lightweight, portable, single-file, simple-as-can-be
+	  ANSI-C compliant JSON parser, under MIT license.
 
 	  https://github.com/DaveGamble/cJSON

bsp/buildroot/package/cjson/cjson.hash

@@ -1,2 +1,3 @@
 # Locally computed:
-sha256 1d976ca423d714b7e836cfbc1980b56f49962d0dfe654edb3c2ffa5c713af242  cjson-v1.2.1.tar.gz
+sha256 28ef8c069db19010b9af247b86b05f0f879ac914a4620997c3e5181465170b40  cjson-v1.7.1.tar.gz
+sha256 a36dda207c36db5818729c54e7ad4e8b0c6fba847491ba64f372c1a2037b6d5c  LICENSE

bsp/buildroot/package/cjson/cjson.mk

@@ -4,10 +4,24 @@
 #
 ################################################################################
 
-CJSON_VERSION = v1.2.1
+CJSON_VERSION = v1.7.1
 CJSON_SITE = $(call github,DaveGamble,cjson,$(CJSON_VERSION))
 CJSON_INSTALL_STAGING = YES
 CJSON_LICENSE = MIT
 CJSON_LICENSE_FILES = LICENSE
+# Set ENABLE_CUSTOM_COMPILER_FLAGS to OFF in particular to disable
+# -fstack-protector-strong which depends on BR2_TOOLCHAIN_HAS_SSP
+CJSON_CONF_OPTS += \
+	-DENABLE_CJSON_TEST=OFF \
+	-DENABLE_CUSTOM_COMPILER_FLAGS=OFF
+
+# If BUILD_SHARED_AND_STATIC_LIBS is set to OFF, cjson uses the
+# standard BUILD_SHARED_LIBS option which is passed by the
+# cmake-package infrastructure.
+ifeq ($(BR2_SHARED_STATIC_LIBS),y)
+CJSON_CONF_OPTS += -DBUILD_SHARED_AND_STATIC_LIBS=ON
+else
+CJSON_CONF_OPTS += -DBUILD_SHARED_AND_STATIC_LIBS=OFF
+endif
 
 $(eval $(cmake-package))