Bug#1124644: ggml FTBFS on riscv64

[Christian Kastner <ckk@debian.org>]

Source: ggml
Version: 0.9.5-1
Severity: serious
Tags: ftbfs sid

ggml FTBFS on riscv64, here the relevant part of the log:

In file included from /build/reproducible-path/ggml-0.9.5/src/ggml-cpu/ggml-cpu.c:14:
/build/reproducible-path/ggml-0.9.5/src/ggml-cpu/vec.h: In function ‘ggml_vec_dot_f16_unroll’:
/build/reproducible-path/ggml-0.9.5/src/ggml-cpu/vec.h:293:31: error: ‘GGML_F16_STEP’ undeclared (first use in this function); did you mean ‘GGML_F32_STEP’?
  293 |         const int np = (n & ~(GGML_F16_STEP - 1));
      |                               ^~~~~~~~~~~~~
      |                               GGML_F32_STEP
/build/reproducible-path/ggml-0.9.5/src/ggml-cpu/vec.h:293:31: note: each undeclared identifier is reported only once for each function it appears in
/build/reproducible-path/ggml-0.9.5/src/ggml-cpu/vec.h:295:9: error: unknown type name ‘GGML_F16_VEC’; did you mean ‘GGML_F32_VEC’?
  295 |         GGML_F16_VEC sum[GGML_VEC_DOT_UNROLL][GGML_F16_ARR] = { { GGML_F16_VEC_ZERO } };
      |         ^~~~~~~~~~~~
      |         GGML_F32_VEC