Deal with gcc_s in extra-libraries field about cabal2nix HOT 4 OPEN

You are right, it would be nice if cabal2nix would recognize that library dependency and do the right thing automatically. I'll take a look at that.

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For future reference, I should add that adding configureFlags = "--ghc-option=-lgcc_s"; is the solution to the problem as pointed out on mailing lists

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I wonder why Cabal itself doesn't manage to pass -lgcc_s in this case? It is in extra-libraries regardless of what packages are passed in (or not) from Nix.

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As sternenseemann pointed out in #552, only two Hackage packages require gcc_s, and both still fail to build for unrelated reasons. Is it still worth attempting to fix this here in cabal2nix (can we reasonably expect new packages to continue to use gcc_s going forward)? If not, I'll close my PR, or someone else can do it themselves.

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