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-mfma not supported by LLVM, leads to warnings on aarch64

Since 7e95f738 -mfma is enable by default on aarch64.

However, this is incorrect in conjunction with -fllvm flag, which doesn't support -mfma it seems.

+'+fma' is not a recognized feature for this target (ignoring feature)
+'+fma' is not a recognized feature for this target (ignoring feature)
+'+fma' is not a recognized feature for this target (ignoring feature)

See https://gitlab.haskell.org/ghc/ghc/-/jobs/1761134

cc @AndreasK

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