move ugly rsync zombie workaround

This reaping of any processes came to cause me problems when redoing the
rsync special remote -- a gpg process that was running gets waited on and
the place that then checks its return code fails.

I cannot reproduce any zombies when using the rsync special remote.
But I still can when using a normal git remote, accessed over ssh.
There is 1 zombie per file downloaded without this horrible hack enabled.

So, move the hack to only be used in that case.

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