Merge pull request #17314 from ryantrinkle/ghcjs-cabal-3494

ghcjs: work around haskell/cabal#3494

pkgs/development/compilers/ghcjs/default.nix

···
       --replace "@CC@"     "${stdenv.cc}/bin/cc"
   '';
   preBuild = ''
+    export HOME="$TMP"
+
     local topDir=$out/lib/ghcjs-${version}
     mkdir -p $topDir