[NativeAOT-LLVM] Bulk memory unexpectedly present as a feature (on `wasi-wasm`, at least)

[SingleAccretion]

Reproduction:

1. Compile WasmDebugging.csproj.
2. Extract the core module, run wasm-objdump -x -j target_features.
3. Observe [+] bulk-memory.

It turns out we still have some use cases where bulk memory is not present; see discord discussion.