mendersoftware / mender-mcu / 1991553009

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chore: return int in response callbacks

This is needed in order to use Zephyr 4.2.0

From https://docs.zephyrproject.org/latest/releases/migration-guide-4.2.html:
```
The http_response_cb_t HTTP client response callback signature has changed.
The callback function now returns int instead of void. This allows the
application to abort the HTTP connection. Existing applications need to
update their response callback implementations. To retain current behavior,
simply return 0 from the callback.
```

In order to not break backwards compatibility we use Zephyr's `ZEPHYR_VERSION`
and `ZEPHYR_VERSION_CODE` to conditionally compile the old callbacks that return void
or the new ones that return int.

Ticket: MEN-8638

Signed-off-by: Daniel Skinstad Drabitzius <daniel.drabitzius@northern.tech>

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