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So that we can still use the testsuite with older compilers.  We
should really test the GHC version, but I don't want to add another
$(shell).  Maybe modifying ghcconfig.hs would be better.

I'm not entirely sure why it changed, but I think it's OK.

Fixes the ghci way

They were claiming to be broken because of #1257, but that is closed as
wontfix.