Bug#1093513: strip-nondeterminism: Claims to normalize `.mo` file when it in fact does not change it

[Niels Thykier]

Package: strip-nondeterminism
Version: 1.14.0-1
Severity: minor
X-Debbugs-Cc: niels at thykier.net

Hi

Reproducer:

```shell
$ TS=$(date -d"Fri, 17 Jan 2025 20:21:22 +0000" -u '+%s')
$ cp da.mo da_norm.mo
$ strip-nondeterminism -T"${TS}" --verbose da_norm.mo
Normalizing da_norm.mo
$ sha256sum da.mo da_norm.mo
52198c63891e23adf5281358c9a3ddd9f0926a1ed357270414eac95bbd77d629  da.mo
52198c63891e23adf5281358c9a3ddd9f0926a1ed357270414eac95bbd77d629  da_norm.mo
```

Besides the incorrect stdout message, this also implies that 
`strip-nondeterminism` rewrote the file for no reason.

I am not sure why this happened because at first glance, the 
`gettext.pm` handler does seem to the correct guards in place. 
Nevertheless, it must be returning a truth value, since the message appears.

Best regards,
Niels
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