build: Configuring with `-mno-sse4.1` does not fail the sse4.1 instrinsics check

I would have expected that `CXXFLAGS="-mno-sse4.1" ./configure` would make the sse4.1 intrinsics check fail but it doesn't:

```
configure:23377: checking for SSE4.1 intrinsics
configure:23396: clang++ -std=c++17 -c -msse4.1 -mno-sse4.1  conftest.cpp >&5
configure:23396: $? = 0
configure:23398: result: yes
```

Not sure what is going on here, seems like a bug.