patch 9.0.1560: Win32: When 'encoding' is set $PATH has duplicate entries Commit: https://github.com/vim/vim/commit/f741e3ec1fcecc8f23f1b37415dc3e80a31d157e Author: K.Takata <kentkt@csc.jp> Date: Mon May 15 16:41:40 2023 +0100 patch 9.0.1560: Win32: When 'encoding' is set $PATH has duplicate entries Problem: Win32: When 'encoding' is set $PATH has duplicate entries. Solution: Only append the directory if it is not there yet. (Ken Takata, closes #12400, closes #12372)

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