GHC no longer ever defines TABLES_NEXT_TO_CODE on its own
It should be entirely the responsibility of make/Hadrian to ensure that everything that needs this flag gets it. GHC shouldn't be hardcoded to assist with bootstrapping since it builds other things besides itself.
I pulled this out of !152 (merged) thinking this might be the most "side effecting" change, and responsible for that PR's failures. But removing it didn't make anything work better, and @nomeata's original comment was this should be redundant with one of the generated headers, so now I'm trying the opposite: just this rather than everything but this.
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