Bump buidlroot version to 2018.02.6

bsp/buildroot/system/skeleton/etc/profile

@@ -8,7 +8,7 @@ if [ "$PS1" ]; then
 	fi
 fi
 
-export PAGER='/bin/more '
+export PAGER='/bin/more'
 export EDITOR='/bin/vi'
 
 # Source configuration files from /etc/profile.d
@@ -16,5 +16,5 @@ for i in /etc/profile.d/*.sh ; do
 	if [ -r "$i" ]; then
 		. $i
 	fi
-	unset i
 done
+unset i