1.7.7 introduces requirement that `global` to be defined

As of 1.7.7 abortcontroller-polyfill requires `global` or `self` to be defined to run
```
import {
  AbortController,
  AbortSignal,
} from "abortcontroller-polyfill/dist/abortcontroller";
```

Is this intentional, would you accept a PR to change this?

`global` isn't defined in the WinterCG runtime spec, and Convex's JS runtime which attempts to follow it doesn't have it defined.