[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Heart defect on Windows since October (#531)

[Christoph Thiede]

Today I tried to update my Squeak VM for Win10, 2004, and found out that the hearbeat primitives (primitiveUtcWithOffset/utcMicrosecondClock) are broken on Windows:

```smalltalk
DateAndTime now. "586455-01-18T09:55:51.955317+02:00"
Time utcMicrosecondClock. "18446744073363013317"
```

The issue occurs both on 32-bit and 64-bit platforms, using a fresh Squeak Trunk image. I tried to narrow down the origin of this issue, but because bintray builds were defect or incomplete between 202010191814 and 202010200140, I can only tell that the issue was born somewhere in the interval (202009300634, 202010210155].

Without ever having read the relevant implementation, I would assume that the issue was introduced in `sqWin32Heartbeat.c` via fae0d31cd52341977d37d150d8d2c9272f9864bf. @eliotmiranda Would this plausible? Can anyone else reproduce the issue?

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