Bug#761571: a cast is enough

[Adam Borowski]

Control: tags -1 +patch

Hi!
Here's a patch that fixes this FTBFS.  I went with a simpler patch,
preserving readability at the cost of failing to fix an Y2038 error.
A better patch would instead cast to int64_t, but upstreams tend to balk
at "%"PRId64"..." which is the portable way to represent such printfs.

Which version you choose it's up to you.

Here's the simpler diff:
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