Build fails on 32 bit architectures

[cinerea0]

When attempting to update darktile from 0.0.10 to 0.0.11, I discovered that it could no longer be built on 32 bit architectures. You can see the build failures in this PR: https://github.com/void-linux/void-packages/pull/37096. I couldn't actually determine where the error is coming from, and none of the code changes in between the versions seem like they'd cause the failure.