gamescope: Add rotation via composition

[tiopex]

Summary

• What is the goal of this PR? bump gamescope and add rotation via composition

Testing

• How was this tested? (e.g. Built and tested on specific devices, manual testing steps, URLs for CI/CD build artifacts.)
• Test results: (e.g. Screenshots, logs, performance metrics if applicable.)

Additional Context

• Add any other information that might be helpful for the reviewer (e.g., performance implications, potential risks, specific areas to focus on.)

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AI Usage

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Did you use AI tools to help write this code? NO

[loki666]

I think you don't even need the --force-orientation anymore

[tiopex]

In theory, yes, but it can't hurt

[xzn]

Is the old patch not applying cleaning to updated gamescope source?

Otherwise I'm curious how is this different from the previous patch (aside from the steamcompmgr fix).

The previous patch already uses composition shader, and since #2907 the cache based on current rotation should work as expected.

[andrebraga]

This lands right adjacent to something I need (the OLED saving pixel shifter; rotation is one of the icky bottlenecks of that pipeline) so I'm all for it; however, doesn't it rightfully belong upstream?

[loki666]

This lands right adjacent to something I need (the OLED saving pixel shifter; rotation is one of the icky bottlenecks of that pipeline) so I'm all for it; however, doesn't it rightfully belong upstream?

it's from upstream, just not merged yet