Cannot fetch submodule on ARM

Hi

Fetching submodule produces a error on ARM builds: https://travis-ci.com/pavelkryukov/putty-aes-ni/jobs/250247395
Meanwhile, same environment works on x86: https://travis-ci.com/pavelkryukov/putty-aes-ni/jobs/250247393

Could anyone please take a look? Maybe there is an old Git version…

Thanks,
Pavel

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