$HOME/.. great for Android 8 and Termux

[積丹尼 Dan Jacobson]

I found in addition to the tips mentioned on
(info "(tramp) Android shell setup")
for Termux on Android 8, one also needs
  (add-to-list 'tramp-remote-path "$HOME/../bin"); else cannot find ls command
  (add-to-list 'tramp-remote-process-environment "TMPDIR=$HOME/../usr/tmp")