[User] make prints warnings on macOS

[mqy]

I've seen several compile warnings for weeks, when build with Makefile on macOS.

Prerequisites

• [*] I am running the latest code.
• [*] I [searched using keywords relevant to my issue](https://docs.github.com/en/issues/tracking-your-work-with-issues/filtering-

Current Behavior

$ git log -1
commit 9d23589d638dc74577d5ff880e6d4248b795f12e (HEAD -> master, tag: master-9d23589, origin/master, origin/HEAD)
Author: Erik Scholz <Green-Sky@users.noreply.github.com>
Date:   Tue Jun 27 19:06:33 2023 +0200

    fix pthreads setaffinity usage on android (#2020)


$ make
I llama.cpp build info: 
I UNAME_S:  Darwin
I UNAME_P:  i386
I UNAME_M:  x86_64
I CFLAGS:   -I.              -O3 -std=c11   -fPIC -DNDEBUG -Wall -Wextra -Wpedantic -Wcast-qual -Wdouble-promotion -Wshadow -Wstrict-prototypes -Wpointer-arith -pthread -march=native -mtune=native -DGGML_USE_K_QUANTS -DGGML_USE_ACCELERATE
I CXXFLAGS: -I. -I./examples -O3 -std=c++11 -fPIC -DNDEBUG -Wall -Wextra -Wpedantic -Wcast-qual -Wno-unused-function -Wno-multichar -pthread -march=native -mtune=native -DGGML_USE_K_QUANTS
I LDFLAGS:   -framework Accelerate
I CC:       Apple clang version 14.0.3 (clang-1403.0.22.14.1)
I CXX:      Apple clang version 14.0.3 (clang-1403.0.22.14.1)

cc  -I.              -O3 -std=c11   -fPIC -DNDEBUG -Wall -Wextra -Wpedantic -Wcast-qual -Wdouble-promotion -Wshadow -Wstrict-prototypes -Wpointer-arith -pthread -march=native -mtune=native -DGGML_USE_K_QUANTS -DGGML_USE_ACCELERATE   -c ggml.c -o ggml.o
ggml.c:2318:5: warning: implicit conversion increases floating-point precision: 'float' to 'ggml_float' (aka 'double') [-Wdouble-promotion]
    GGML_F16_VEC_REDUCE(sumf, sum);
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ggml.c:1950:37: note: expanded from macro 'GGML_F16_VEC_REDUCE'
#define GGML_F16_VEC_REDUCE         GGML_F32Cx8_REDUCE
                                    ^
ggml.c:1940:33: note: expanded from macro 'GGML_F32Cx8_REDUCE'
#define GGML_F32Cx8_REDUCE      GGML_F32x8_REDUCE
                                ^
ggml.c:1886:11: note: expanded from macro 'GGML_F32x8_REDUCE'
    res = _mm_cvtss_f32(_mm_hadd_ps(t1, t1));                     \
        ~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ggml.c:3360:9: warning: implicit conversion increases floating-point precision: 'float' to 'ggml_float' (aka 'double') [-Wdouble-promotion]
        GGML_F16_VEC_REDUCE(sumf[k], sum[k]);
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ggml.c:1950:37: note: expanded from macro 'GGML_F16_VEC_REDUCE'
#define GGML_F16_VEC_REDUCE         GGML_F32Cx8_REDUCE
                                    ^
ggml.c:1940:33: note: expanded from macro 'GGML_F32Cx8_REDUCE'
#define GGML_F32Cx8_REDUCE      GGML_F32x8_REDUCE
                                ^
ggml.c:1886:11: note: expanded from macro 'GGML_F32x8_REDUCE'
    res = _mm_cvtss_f32(_mm_hadd_ps(t1, t1));                     \
        ~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ggml.c:578:23: warning: unused function 'mul_sum_i8_pairs' [-Wunused-function]
static inline __m128i mul_sum_i8_pairs(const __m128i x, const __m128i y) {
                      ^
ggml.c:609:19: warning: unused function 'hsum_i32_4' [-Wunused-function]
static inline int hsum_i32_4(const __m128i a) {
                  ^
ggml.c:674:23: warning: unused function 'packNibbles' [-Wunused-function]
static inline __m128i packNibbles( __m256i bytes )
                      ^
5 warnings generated.

Environment and Context

System into printed by main:

system_info: n_threads = 4 / 12 | AVX = 1 | AVX2 = 1 | AVX512 = 0 | AVX512_VBMI = 0 | AVX512_VNNI = 0 | FMA = 1 | NEON = 0 | ARM_FMA = 0 | F16C = 1 | FP16_VA = 0 | WASM_SIMD = 0 | BLAS = 1 | SSE3 = 1 | VSX = 0 | 

[github-actions]

This issue was closed because it has been inactive for 14 days since being marked as stale.