dev-util/nvidia-cuda-toolkit: add 12.8.0, rework ebuildHEADmaster

Add support for arm64.
Add support for clang.
Add checks for DRIVER_PV and GCC_MAX_VER/CLANG_MAX_VER.

Drop Visual Tools to add them as separate packages.

Use makepkg script to unpack the archive. unpacker.eclass doesn't allow to
exclude files, which we rely on to keep the temp dir size down.
Use the manifest file from the archive to generate the file list.
Use move instead of doins. This ensures we do not miss files and permissions as
older versions did.
This method also adds the pkgconfig files that were never generated or installed
prior.

This no longer installs the toolkit to /opt/cuda, but /opt/cuda-${PV} and
creates a symlink from the old location. Once we removed cuda-config in favour
of a run-time detection via cuda.eclass, this will allow a slotted install of
multiple CUDA versions.

Closes: https://bugs.gentoo.org/947042
Closes: https://bugs.gentoo.org/939906
Closes: https://bugs.gentoo.org/916976
Closes: https://bugs.gentoo.org/840140
Signed-off-by: Paul Zander <negril.nx+gentoo@gmail.com>
Closes: https://github.com/gentoo/gentoo/pull/40539
Signed-off-by: Sam James <sam@gentoo.org>

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