[whatwg/fetch] Solely matching `*` (#798)

https://fetch.spec.whatwg.org/commit-snapshots/3ca2ee5968a60883c9e302f296047d539337b6dd/#http-new-header-syntax

> For \`Access\-Control\-Expose\-Headers\`, \`Access\-Control\-Allow\-Methods\`, and \`Access\-Control\-Allow\-Headers\` response headers the value \`\*\` counts as a wildcard for requests without credentials\. For such requests there is no way to solely match a header name or method that is \`\*\`\.

I believe that, contrary to the quoted text, it is possible to solely match `*` values via repetition. For example:
```
Access-Control-Allow-Headers: *, *
```

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