Simple Linux 0.2.31

Smaller again; the installer, the offline payload, the stage3, the kernel files and the Zen profile are those of 0.2.30. Sizes (0.2.30 → 0.2.31): GUI 560 → 513 MiB, minimal 369 → 361 MiB, GUI offline 1750 → 1703 MiB, minimal offline 1558 → 1551 MiB. Checked in QEMU, not on real hardware: the minimal image booted with the tools below; a test image built from the same GUI tree was run on the virtual GPU (niri and Noctalia up, a wallpaper set, a terminal opened, the installer window shown). The finished GUI ISO itself was not booted.

• No LLVM in the GUI image. Mesa is built without it (USE=-llvm): the AMD driver (radeonsi) compiles with its own compiler (ACO), and software OpenGL is softpipe instead of llvmpipe; the 107 MiB libLLVM is gone (27 MiB compressed), together with the SPIR-V helpers and clang. A machine with no usable graphics card still gets the graphical installer in its fallback window. Not tested on an AMD graphics card, only on the virtual GPU.
• Portage's saved build environments (environment.bz2, 12 MiB, already compressed) are left out: only emerge -C reads them.
• Noctalia's default wallpaper (a 5 MiB PNG) is left out; the live image sets its own wallpaper at every start.
• iso/slim-excludes.py refuses to build if a program that stays still needs a library it would drop, so a Mesa that still wanted LLVM cannot ship by accident.