MSVC builds seems to be full of warning, which makes debugging harder.

For example:

```
wasm-interpreter.h(4702,9): warning C4068: unknown pragma 'GCC' [C:\a\binaryen\binaryen\out\binaryen.vcxproj]
```

And:

```
cl : command line  warning D9002: ignoring unknown option '-fno-rtti' [C:\a\binaryen\binaryen\out\third_party\gtest.vcxproj]
```