vulkan: throw system error instead of SIGABRT during init on older devices #16156
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Fixes #16142
Main issue is
llama_supports_gpu_offloadshould not get SIGABRT if backend can't initialize correctly inggml_vk_instance_init. System error will make sure it is not added to registry anyway.Optionally, added catches in
ggml_backend_vk_regto returnnullfor any errors, unless this was intended to be handled upstream. In that case i can remove that commit.