[ggml-quants] Limit neon to arm v8 where applicable

vqtbl1q_u8 is not part of arm v7 neon library

Author: rgryta

ggml-quants.c

@@ -9452,7 +9452,7 @@ void ggml_vec_dot_iq3_s_q8_K (int n, float * GGML_RESTRICT s, size_t bs, const v
 
     const int nb = n / QK_K;
 
-#if defined(__ARM_NEON)
+#if defined(__ARM_NEON) && (__ARM_ARCH >= 8)
 
    static const uint8_t k_mask1[32] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
                                        0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03