Old IncrementalBuilder: Fix cancellation token not passed to tcExtras

[majocha]

Browsing this code I noticed cancellation token was not passed in one situation. My bad, probably.
Not sure if this improves performance at all or decreases it. Not sure if this still works correctly with this change. I'll install this and test in use.
Old incremental builder unlike Transparent Compiler is opaque, indeed.

[github-actions]

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