What is causing the "Unrecognized field abi" warning?

[Sven Panne]

This shows up in more recent builds of my packages on Travis CI, e.g.
https://travis-ci.org/haskell-opengl/OpenGL/jobs/93814917#L296, but I don't
have a clue what's causing it (GHC? cabal? Something else?), if I should
ignore it or if I should somehow act on that. :-/ My gut feeling is that
it's GHC, but I might be wrong...

Cheers,
   S.
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