Bug#1052144: ghc: Needs to link against libatomic on at least m68k

[John Paul Adrian Glaubitz]

Control: tags -1 +patch

Hi!

The attached patch fixes the issue for me. The underlying problem is
the use of legacy atomic functions for which no 64-bit variants exist
on some architectures [1]. See also the upstream discussion here [2].

While this patch fixes the original problem, the stage2 build later
fails due to memory exhaustion for which I haven't found a solution
yet.

Thanks,
Adrian

> [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63368
> [2] https://gitlab.haskell.org/ghc/ghc/-/issues/23974

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