Proposal: provide cas and barriers symbols even without -threaded

[Ryan Newton]

If anyone knows the proper way to fix this bug, btw, it would be greatly
appreciated.  I don't know the right way to make sure a library gets linked
against RTS symbols like "stg_MUT_VAR_CLEAN_info" even when it is loaded by
GHCI.


>
>   For example, this bug:
>
>     https://github.com/rrnewton/haskell-lockfree-queue/issues/10
>
>
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