[releng] Issue #7525: unreasonable large build.log files for mingw-qt

[Till Maas]

till reported a new issue against the project: `releng` that you are following:
``
```
du -hcs /mnt/koji/packages/mingw-qt/*/*/data/logs/*/build.log
[...]
253M    /mnt/koji/packages/mingw-qt/4.8.7/1.fc25/data/logs/armv7hl/build.log
253M    /mnt/koji/packages/mingw-qt/4.8.7/1.fc25/data/logs/i686/build.log
253M    /mnt/koji/packages/mingw-qt/4.8.7/1.fc25/data/logs/x86_64/build.log
2,7G    /mnt/koji/packages/mingw-qt/4.8.7/2.fc26/data/logs/aarch64/build.log
2,7G    /mnt/koji/packages/mingw-qt/4.8.7/2.fc26/data/logs/armv7hl/build.log
2,7G    /mnt/koji/packages/mingw-qt/4.8.7/2.fc26/data/logs/i686/build.log
2,7G    /mnt/koji/packages/mingw-qt/4.8.7/2.fc26/data/logs/ppc64/build.log
2,7G    /mnt/koji/packages/mingw-qt/4.8.7/2.fc26/data/logs/ppc64le/build.log
2,7G    /mnt/koji/packages/mingw-qt/4.8.7/2.fc26/data/logs/x86_64/build.log
2,7G    /mnt/koji/packages/mingw-qt/4.8.7/3.fc26/data/logs/aarch64/build.log
2,7G    /mnt/koji/packages/mingw-qt/4.8.7/3.fc26/data/logs/armv7hl/build.log
2,7G    /mnt/koji/packages/mingw-qt/4.8.7/3.fc26/data/logs/i686/build.log
2,7G    /mnt/koji/packages/mingw-qt/4.8.7/3.fc26/data/logs/ppc64/build.log
2,7G    /mnt/koji/packages/mingw-qt/4.8.7/3.fc26/data/logs/ppc64le/build.log
2,7G    /mnt/koji/packages/mingw-qt/4.8.7/3.fc26/data/logs/x86_64/build.log
2,7G    /mnt/koji/packages/mingw-qt/4.8.7/3.fc27/data/logs/aarch64/build.log
2,7G    /mnt/koji/packages/mingw-qt/4.8.7/3.fc27/data/logs/armv7hl/build.log
2,7G    /mnt/koji/packages/mingw-qt/4.8.7/3.fc27/data/logs/i686/build.log
2,7G    /mnt/koji/packages/mingw-qt/4.8.7/3.fc27/data/logs/ppc64/build.log
2,7G    /mnt/koji/packages/mingw-qt/4.8.7/3.fc27/data/logs/ppc64le/build.log
2,7G    /mnt/koji/packages/mingw-qt/4.8.7/3.fc27/data/logs/s390x/build.log
2,7G    /mnt/koji/packages/mingw-qt/4.8.7/3.fc27/data/logs/x86_64/build.log
69G
```
``

To reply, visit the link below or just reply to this email
https://pagure.io/releng/issue/7525