llvm21 is a Mesa (graphics) build dep used by mesa and libepoxy for
shader compilation. It is NOT required for the redbear-mini or
redbear-grub text-only targets, but the pre-cook list was cooking
it unconditionally, adding a 30+ minute stall to every mini build.
Pre-cook only relibc + icu for mini/grub. The full desktop chain
(including llvm21) is still pre-cooked for redbear-full.
vasilito
c4322ae097