Encoding issue in git gui

[Anton Tsyganenko <anton-tsyganenko@xxxxxxxxx>]

When I run a tool from tools menu in the standard git gui, the output
seems to have wrong encoding. For example, add a tool called "encoding
test" that runs command "echo Проверка", then run it. In the output
window "Проверка" in printed instead of "Проверка".

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