cabal-install: improve Sierra compatibility #6412
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On Sierra, uses the new --dynlibdir, which upstream backported to the
1.24 release branch. The setting defaults to $libdir/$abi and avoids
ghc: panic! (the 'impossible' happened)
malformed mach-o: load commands size (x) > 32768
See
haskell/cabal#3979 (haskell/cabal@d2da655)
haskell/cabal#4011 (haskell/cabal@5c901a6)
https://ghc.haskell.org/trac/ghc/ticket/12479
https://phabricator.haskell.org/D2611