Bump buidlroot version to 2018.02.6

bsp/buildroot/support/download/check-hash

@@ -42,8 +42,9 @@ if [ ! -f "${h_file}" ]; then
 fi
 
 # Check one hash for a file
-# $1: known hash
-# $2: file (full path)
+# $1: algo hash
+# $2: known hash
+# $3: file (full path)
 check_one_hash() {
     _h="${1}"
     _known="${2}"

bsp/buildroot/support/download/git

@@ -85,8 +85,11 @@ if [ ${recurse} -eq 1 ]; then
     _git submodule update --init --recursive
 fi
 
-# We do not need the .git dir; we keep other .git files, in case they
+# We do not want the .git dir; we keep other .git files, in case they
 # are the only files in their directory.
+# The .git dir would generate non reproducible tarballs as it depends on
+# the state of the remote server. It also would generate large tarballs
+# (gigabytes for some linux trees) when a full clone took place.
 rm -rf .git
 
 popd >/dev/null

bsp/buildroot/support/download/svn

@@ -33,6 +33,6 @@ _svn() {
     eval ${SVN} "${@}"
 }
 
-_svn --non-interactive export ${verbose} "${@}" "'${repo}@${rev}'" "'${basename}'"
+_svn export ${verbose} "${@}" "'${repo}@${rev}'" "'${basename}'"
 
 tar czf "${output}" "${basename}"