ffmpeg: switch to scale_cuda for CUDA 13 support#449
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scale_cuda replaces scale_npp. CUDA 13 dropped compute_60; default preserved for CUDA 11/12, override via env for newer SDKs.
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CUDA 13 drops the ffmpeg libnpp wrappers. Switch ffmpeg to
scale_cuda (cherry-pick from eli/no-npp), and in
install_ffmpeg.sh drop --enable-libnpp, swap the
--enable-filter flag, and expose NVCC_GENCODE_ARCH/SM overrides
(13 removed compute_60).
Built against nvidia/cuda:13.0.0-devel-ubuntu22.04 with
NVCC_GENCODE_ARCH=compute_75. CUDA 11/12 unchanged with no env.
Container-built binary repackaged as a .deb installs cleanly on
ubuntu:22.04/24.04 and debian:13 (bare-metal path validated).