Add DietPi to the wild tests.

40K lines of shell parses!  Although dietpi-software uses:

a[$index]=0

which we don't yet parse correctly.

test/wild.sh

@@ -195,6 +195,12 @@ all-manifests() {
    $(find $src '(' -name debootstrap -o -name functions ')' -a -printf '%P\n') \
    $(find $src/scripts -type f -a -printf 'scripts/%P\n')

  # There are lot of dietpi-* bash scripts that aren't executable, for some
  # reason.  Big hairy shell scripts here.
  src=~/git/wild/distro/DietPi
  _manifest distro/DietPi $src \
    $(find $src '(' -name '*.sh' -o -name 'dietpi-*' ')' -a -printf '%P\n') \

  src=~/src/grep-2.24
  _sh-manifest $src gnu