message: set minimum clang-format version to 13!
diff: @@ -8,8 +8,8 @@ FOLDERS=("src" "test")
  # Some distros just call it clang-format. Others (e.g. Ubuntu) are insistent
  # that the version number be part of the command. We prefer clang-format if
  # that's present, otherwise we work backwards from highest version to lowest
  -# version.
  -for clangfmt in clang-format{,-{4,3}.{9,8,7,6,5,4,3,2,1,0}}; do
  +# version but at least 13.
  +for clangfmt in clang-format{,-{1,2,3}{9,8,7,6,5,4,3}}; do
  if which "$clangfmt" &>/dev/null; then
  FMT="$clangfmt"
  break
  