Patch toluapp for reproducible output

[bmwiedemann]

Checklist

• I have described the changes
• I have linked to any relevant GitHub issues, if applicable
• Documentation in doc/ has been updated
• All new code is licensed under GPLv3

Description

• Describe the changes, why they were necessary, etc
  • Without this patch, the generated libimlib2.c and libcairo.so varied every time.
• Describe how the changes will affect existing behaviour.
  • It should behave the same as before
• Describe how you tested and validated your changes.
  • I tested that it builds, but not if it works.
• Include any relevant screenshots/evidence demonstrating that the changes work and have been tested.
  • NA

This PR was done while working on reproducible builds for openSUSE.

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[bmwiedemann]

Unfortuately, https://github.com/LuaDist/toluapp is read-only, so I could not contribute these patches there. If you use a different upsteam, feel free to push patches there.

[brndnmtthws]

Sweet, thanks!