There's a merged pull request on the void-packages repository

obconf: move to gtk3
https://github.com/void-linux/void-packages/pull/43880

Description:
patches are downloaded directly from the source because they are so large.

closes #40398
progress on libglade removal (for #38229) and gtk2 removal

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#### Testing the changes
- I tested the changes in this PR: **NO** (I don't run openbox)