* discover: use the SBSA CUDA build on JetPack 7 (L4T r38+)
JetPack 7 supports SBSA-based CUDA, so the standard cuda_v13 build — shipped
in the base linux-arm64 package, and given the Orin arch (CC 8.7) in #16628
— runs on these devices.
JETSON_JETPACK=7 previously selected a nonexistent jetpack7 runner, so
runner.go skipped every CUDA library and discovery fell back to CPU. The L4T
releases JetPack 7 uses (r38 on Thor, r39 on Orin) also hit the unrecognized
branch, and install.sh warned the version was unsupported. Map JetPack 7+
(L4T r38 and newer) to cuda_v13 (returned as "" from cudaJetpack); no
Jetson-specific download is needed, so install.sh no longer warns.
Fixes#16602
* discover: fall back to standard CUDA when the JetPack runner is absent
Per review, drop the L4T-version mapping (in cudaJetpack and install.sh) and
instead clear the jetpack override in runner.go when the detected cuda_jetpack
runner isn't installed. Normal discovery then selects the standard cuda_v13
build, which supports Orin (CC 8.7) on JetPack 7.
Kevin Park
624cada952