Setting CHERE_INVOKING=1 does not work because of case mismatch

[Lennart Borgman]

In current cygwin (just updated) I need to downcase the test for
CHERE_INVOKING in .profile to make it work, i.e. it need to look like:

  if [ ! -z "${chere_invoking}" ]; then
        unset CHERE_INVOKING
  else
        cd "${HOME}"
  fi

This is on Windows XP.

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