mimalloc adds >60kb into output artifacts

Using em++:

```
emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 3.1.61 (67fa4c16496b157a7fc3377afd69ee0445e8a6e3)
clang version 19.0.0git (https:/github.com/llvm/llvm-project 7cfffe74eeb68fbb3fb9706ac7071f8caeeb6520)
Target: wasm32-unknown-emscripten
Thread model: posix
```

Adding `-s MALLOC=mimalloc` adds additional 52kb into .wasm and 9kb into .js outputs. Is that expected?

Example:

```sh
em++ main.cpp -s MALLOC=mimalloc -O3 -o wasm/mfcc.js
# produces: 60kb .wasm + 13kb .js
```

```sh
em++ main.cpp -O3 -o wasm/mfcc.js
# produces: 8kb .wasm + 4kb .js
```

Just checking, is that expected? Is the mimalloc so heavy?