Build fails with the latest release when built in debug mode

The build fails with the following error:

```
sqlite3.c:273888:31: error: ‘mcVfsGlobal’ undeclared (first use in this function); did you mean ‘mcVfsSleep’?
   assert(p->pMainNext == 0 && mcVfsGlobal.pMain != p);
```

You can take a look at [this run](https://github.com/m4heshd/better-sqlite3-multiple-ciphers/runs/6191283275?check_suite_focus=true#step:5:52) to inspect the error in depth.