chore: keep the gamescope GBM scan-out patch (NVIDIA picture fix) in patches/

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KkpbsMw4rQyBsxDG6ebHK2

patches/README.md

@@ -16,3 +16,4 @@ read and reviewed on their own. `lib/*.sh` reads them with `patch_file
 | `steamify-os-release.sh`, `steamify-os-release.hook` | `lib/login-manager.sh` (SteamOS conversion) | What Steam's System settings show besides the OS name (which stays CachyOS's): `VERSION_ID=steamos-X.Y`, `VERSION_CODENAME=steam-machine`, `VARIANT`/`VARIANT_ID` Steamify with its version, in `/etc/os-release`; the pacman hook runs it again after cachyos-hooks (`fill SCRIPT=... VERSION=... STEAMOS=...`) |
 | `steamify-nvidia-initramfs.sh`, `steamify-nvidia-initramfs.hook` | `lib/nvidia.sh` (SteamOS conversion, NVIDIA fix) | The pacman hook (before the initramfs is built, after DKMS) and its script: the NVIDIA modules go into the initramfs only while every installed kernel has them, decided again at every kernel or driver change (`fill SCRIPT=...`) |
 | `cros-ec-cec-single-port.patch` | `lib/cec.sh` (HDMI-CEC) | Makes Valve's Steam Machine CEC driver find amdgpu's HDMI port |
+| `gamescope-gbm-scanout.patch` | `lib/nvidia.sh` (gamescope on NVIDIA) | gamescope 3.16.31 patch: scan-out buffers allocated with GBM (opt-in, `gamescope_drm_gbm_scanout=1`), which cures the corrupted picture on NVIDIA; from farnoy/gamescope, see the header of the file |