Revert "modules: Add missing opt_*.h files for stand-alone compile"

This reverts commit 1a37caeb076b9d31e13c54691d7f1eeb589798bb.

I'd overlooked 06c07e1203324bfe8ab4526c82dbb750864272d5 when I updated a
branch I'd previously committed but not updated. My search for this in
my tree before the commit was to a stale file...

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