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WebKitGTK's dmabuf render path core-dumps on some Mesa drivers under rootless XWayland, killing the AppImage before any window appears. The bundle is pinned to GDK_BACKEND=x11 by linuxdeploy's GTK apprun-hook, and dmabuf only buys zero-copy page flips on native Wayland, so disabling it costs nothing on this codepath. Scoped to the AppImage post-process rather than Rust or tauri.conf.json: the .deb runs on native Wayland where dmabuf works, and disabling it there would be a rendering regression. Set in the existing launcher shim rather than a new apprun-hook file because AppRun.wrapped execs the shim unconditionally and the script already guards its installation. Also documents the libsystemd removal (#2335) in the root-cause header, which the file's convention requires for every removal. Co-authored-by: Will Pfleger <pfleger.will@gmail.com> Signed-off-by: Will Pfleger <pfleger.will@gmail.com>