The patch needs SDK 10.0.19041.0 [which is the version we officially require](https://firefox-source-docs.mozilla.org/setup/windows_build.html) but workers are building with 10.0.17134.0 at the moment.
Bug 1803334 Comment 2 Edit History
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The patch needs a more recent SDK (10.0.19041.0, [which is the version we officially support](https://firefox-source-docs.mozilla.org/setup/windows_build.html), works); workers are building with 10.0.17134.0 at the moment.