Draft: Hadrian: Add option to generate .hie files for stage1 libraries

Setting ghcHieFiles = True turns on -fwrite-ide-info which generates .hie files for all Haskell files built in stage2.

It is necessary to distribute .hie files for base libraries as you need to build a .hie file with the same version of the compiler as you use to read it. Therefore, for a release, these files will be generated with the release compiler. You can't rebuild most base libraries yourself in order to generate these files.

I am not sure this is the best approach -- .hie files are a bit like documentation but adding the option directly to the invocation of ghc was the easiest option.

TODO: In the bindist rule we should perhaps gather up all the .hie files and place them into their own directory.

cc @wz1000