ggml-cpu:fix RISC-V Q4_0 repack select and RVV feature reporting#17951

ggerganov merged 3 commits intoggml-org:masterggml-org/llama.cpp:masterfrom

ixgbe:fix_riscv_q4_0_repack_selectionixgbe/llama.cpp:fix_riscv_q4_0_repack_selectionCopy head branch name to clipboard