Snippets for whisper.cpp 1.9.1 from Alpine s390x

Sourced from https://build.alpinelinux.org/buildlogs/build-edge-s390x/testing/whisper.cpp/whisper.cpp-1.9.1-r0.log.

• /home/buildozer/aports/testing/whisper.cpp/src/whisper.cpp-1.9.1/ggml/src/ggml-cpu/arch/s390/quants.c:275:15: warning: unused variable 'nb' [-Wunused-variable]
    275 |     const int nb = n / qk;
        |               ^~