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

New package: gamescope-3.14.1
https://github.com/void-linux/void-packages/pull/48354

Description:
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Add Valve's Gamescope as requested in #36869. If this is merged, `steamos-compositor` should probably be removed from the repository at some point.

This PR also adds `libliftoff` as a dependency. Gamescope also vendors some dependencies, but I believe I've handled this correctly.

#### Testing the changes
- I tested the changes in this PR: **YES**

#### New package
- This new package conforms to the [package requirements](https://github.com/void-linux/void-packages/blob/master/CONTRIBUTING.md#package-requirements): **YES**

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#### Local build testing
- I built this PR locally for my native architecture, (x86_64-glibc)