whisper passed -DGGML_HIPBLAS=ON, which ggml no longer knows, so the
hipblas image was a CPU-only build (same issue as #10666 in
qwen3-tts-cpp). Use GGML_HIP with the ROCm clang and forward the gfx
targets. parakeet-cpp enabled PARAKEET_GGML_HIP but did not forward
the gfx targets; forward them the same way.
Docs-Not-Needed: build flags only, no user-facing behaviour or option changes.
Assisted-by: Claude Code:claude-opus-5-5
Signed-off-by: Stefan Walcz <stefan.walcz@walcz.de>