GHC panic on GHC 8.6.3 and darwin

See https://hydra.nixos.org/build/87359468

Tail:

[4 of 4] Compiling Data.ByteString.Conversion ( src/Data/ByteString/Conversion.hs, dist/build/Data/ByteString/Conversion.p_o )
ld: warning: /nix/store/rqidc655gspxi25b7q7g81nmzbzv6l22-libiconv-osx-10.11.6/lib/libiconv.dylib, ignoring unexpected dylib file
ld: warning: /nix/store/rqidc655gspxi25b7q7g81nmzbzv6l22-libiconv-osx-10.11.6/lib/libiconv.dylib, ignoring unexpected dylib file
ghc: panic! (the 'impossible' happened)
  (GHC version 8.6.3 for x86_64-apple-darwin):
        Data.Binary.Get.runGet at position 8: Invalid magic number "INPUT(-l"
CallStack (from HasCallStack):
  error, called at libraries/binary/src/Data/Binary/Get.hs:351:5 in binary-0.8.6.0:Data.Binary.Get

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

builder for '/nix/store/mzkihq3zbxg1wxqiqm8ymay8lasb39b3-bytestring-conversion-0.3.1.drv' failed with exit code 1