Fix Meson build

Author: AntoinePrv

cpp/src/arrow/meson.build

@@ -177,7 +177,7 @@ arrow_util_srcs = [
     'util/bitmap_ops.cc',
     'util/bpacking.cc',
     'util/bpacking_scalar.cc',
-    'util/bpacking_simd_default.cc',
+    'util/bpacking_simd_128.cc',
     'util/byte_size.cc',
     'util/byte_stream_split_internal.cc',
     'util/cancel.cc',