[whatwg/webidl] export "is a platform object" (PR #1427)

This algo is being used in <https://github.com/w3c/css-houdini-drafts/pull/1127>, but since it's unexported (and thus not linking by default), the author of that PR is dropping down to a manual anchor.


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### :boom: Error: 500 Internal Server Error :boom: ###

[PR Preview](https://github.com/tobie/pr-preview#pr-preview) failed to build. _(Last tried on Aug 22, 2024, 10:52 PM UTC)_.

<details>
<summary>More</summary>


PR Preview relies on a number of web services to run. There seems to be an issue with the following one:

:rotating_light: [CSS Spec Preprocessor](https://api.csswg.org/bikeshed/) - CSS Spec Preprocessor is the web service used to build Bikeshed specs.

:link: [Related URL]([object Object])



_If you don't have enough information above to solve the error by yourself (or to understand to which web service the error is related to, if any), please [file an issue](https://github.com/tobie/pr-preview/issues/new?title=Error%20not%20surfaced%20properly&body=See%20whatwg/webidl%231427.)._
</details>

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/webidl/pull/1427

-- Commit Summary --

  * export "is a platform object"

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/whatwg/webidl/pull/1427.patch
https://github.com/whatwg/webidl/pull/1427.diff

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