expand $topdir in the output of 'ghc-pkg field' this fixed #937, and gets us further towards 'setup haddock' working for Cabal on Windows.
expand $topdir in the output of 'ghc-pkg field'
this fixed #937, and gets us further towards 'setup haddock' working
for Cabal on Windows.

spacekitteh/smcghc,ryantm/ghc,nomeata/ghc,TomMD/ghc,ryantm/ghc,vTurbine/ghc,mcschroeder/ghc,ekmett/ghc,shlevy/ghc,hferreiro/replay,spacekitteh/smcghc,nushio3/ghc,urbanslug/ghc,elieux/ghc,mcmaniac/ghc,anton-dessiatov/ghc,nushio3/ghc,lukexi/ghc,green-haskell/ghc,mcschroeder/ghc,christiaanb/ghc,sgillespie/ghc,fmthoma/ghc,ezyang/ghc,siddhanathan/ghc,green-haskell/ghc,jstolarek/ghc,snoyberg/ghc,jstolarek/ghc,mcmaniac/ghc,da-x/ghc,GaloisInc/halvm-ghc,mettekou/ghc,nathyong/microghc-ghc,frantisekfarka/ghc-dsi,olsner/ghc,GaloisInc/halvm-ghc,tjakway/ghcjvm,nathyong/microghc-ghc,hferreiro/replay,holzensp/ghc,da-x/ghc,nkaretnikov/ghc,oldmanmike/ghc,hferreiro/replay,tibbe/ghc,GaloisInc/halvm-ghc,ezyang/ghc,mcmaniac/ghc,acowley/ghc,mettekou/ghc,holzensp/ghc,da-x/ghc,green-haskell/ghc,nomeata/ghc,ezyang/ghc,acowley/ghc,da-x/ghc,nkaretnikov/ghc,TomMD/ghc,mettekou/ghc,da-x/ghc,frantisekfarka/ghc-dsi,lukexi/ghc-7.8-arm64,nushio3/ghc,sdiehl/ghc,anton-dessiatov/ghc,sdiehl/ghc,ilyasergey/GHC-XAppFix,tibbe/ghc,gridaphobe/ghc,sgillespie/ghc,mfine/ghc,fmthoma/ghc,elieux/ghc,GaloisInc/halvm-ghc,forked-upstream-packages-for-ghcjs/ghc,siddhanathan/ghc,spacekitteh/smcghc,ezyang/ghc,acowley/ghc,mfine/ghc,olsner/ghc,oldmanmike/ghc,ekmett/ghc,da-x/ghc,AlexanderPankiv/ghc,sgillespie/ghc,shlevy/ghc,gridaphobe/ghc,hferreiro/replay,vikraman/ghc,tjakway/ghcjvm,vTurbine/ghc,olsner/ghc,tjakway/ghcjvm,acowley/ghc,hferreiro/replay,ml9951/ghc,vTurbine/ghc,nathyong/microghc-ghc,bitemyapp/ghc,mcschroeder/ghc,nushio3/ghc,sgillespie/ghc,forked-upstream-packages-for-ghcjs/ghc,ml9951/ghc,tibbe/ghc,fmthoma/ghc,wxwxwwxxx/ghc,gcampax/ghc,sdiehl/ghc,lukexi/ghc-7.8-arm64,urbanslug/ghc,acowley/ghc,acowley/ghc,anton-dessiatov/ghc,ml9951/ghc,siddhanathan/ghc,snoyberg/ghc,olsner/ghc,wxwxwwxxx/ghc,ilyasergey/GHC-XAppFix,ezyang/ghc,hferreiro/replay,wxwxwwxxx/ghc,ml9951/ghc,ezyang/ghc,oldmanmike/ghc,shlevy/ghc,green-haskell/ghc,gcampax/ghc,tjakway/ghcjvm,bitemyapp/ghc,acowley/ghc,siddhanathan/ghc,snoyberg/ghc,holzensp/ghc,lukexi/ghc,gcampax/ghc,nomeata/ghc,snoyberg/ghc,vikraman/ghc,forked-upstream-packages-for-ghcjs/ghc,anton-dessiatov/ghc,christiaanb/ghc,gridaphobe/ghc,shlevy/ghc,wxwxwwxxx/ghc,urbanslug/ghc,tjakway/ghcjvm,nomeata/ghc,anton-dessiatov/ghc,nushio3/ghc,lukexi/ghc-7.8-arm64,shlevy/ghc,vikraman/ghc,vTurbine/ghc,sgillespie/ghc,ghc-android/ghc,vikraman/ghc,siddhanathan/ghc,christiaanb/ghc,lukexi/ghc,GaloisInc/halvm-ghc,nkaretnikov/ghc,urbanslug/ghc,forked-upstream-packages-for-ghcjs/ghc,ml9951/ghc,lukexi/ghc,TomMD/ghc,oldmanmike/ghc,olsner/ghc,nathyong/microghc-ghc,ryantm/ghc,mettekou/ghc,elieux/ghc,jstolarek/ghc,ezyang/ghc,sgillespie/ghc,urbanslug/ghc,AlexanderPankiv/ghc,olsner/ghc,fmthoma/ghc,gridaphobe/ghc,ekmett/ghc,AlexanderPankiv/ghc,mfine/ghc,mettekou/ghc,anton-dessiatov/ghc,tjakway/ghcjvm,nushio3/ghc,gcampax/ghc,GaloisInc/halvm-ghc,anton-dessiatov/ghc,snoyberg/ghc,gcampax/ghc,jstolarek/ghc,frantisekfarka/ghc-dsi,forked-upstream-packages-for-ghcjs/ghc,ghc-android/ghc,mfine/ghc,wxwxwwxxx/ghc,nkaretnikov/ghc,frantisekfarka/ghc-dsi,christiaanb/ghc,ml9951/ghc,GaloisInc/halvm-ghc,vTurbine/ghc,nathyong/microghc-ghc,mcmaniac/ghc,sdiehl/ghc,AlexanderPankiv/ghc,bitemyapp/ghc,shlevy/ghc,ghc-android/ghc,mfine/ghc,ryantm/ghc,sgillespie/ghc,mcmaniac/ghc,TomMD/ghc,nkaretnikov/ghc,vTurbine/ghc,vikraman/ghc,fmthoma/ghc,da-x/ghc,bitemyapp/ghc,gcampax/ghc,snoyberg/ghc,lukexi/ghc-7.8-arm64,ghc-android/ghc,fmthoma/ghc,TomMD/ghc,ghc-android/ghc,TomMD/ghc,shlevy/ghc,urbanslug/ghc,AlexanderPankiv/ghc,forked-upstream-packages-for-ghcjs/ghc,jstolarek/ghc,ekmett/ghc,gridaphobe/ghc,mcschroeder/ghc,mfine/ghc,elieux/ghc,bitemyapp/ghc,olsner/ghc,mcschroeder/ghc,siddhanathan/ghc,hferreiro/replay,forked-upstream-packages-for-ghcjs/ghc,ghc-android/ghc,TomMD/ghc,vikraman/ghc,mettekou/ghc,holzensp/ghc,christiaanb/ghc,mettekou/ghc,elieux/ghc,gcampax/ghc,vTurbine/ghc,holzensp/ghc,wxwxwwxxx/ghc,tibbe/ghc,oldmanmike/ghc,green-haskell/ghc,mfine/ghc,gridaphobe/ghc,AlexanderPankiv/ghc,tjakway/ghcjvm,ilyasergey/GHC-XAppFix,tibbe/ghc,mcschroeder/ghc,vikraman/ghc,urbanslug/ghc,wxwxwwxxx/ghc,frantisekfarka/ghc-dsi,ilyasergey/GHC-XAppFix,nomeata/ghc,ml9951/ghc,oldmanmike/ghc,nathyong/microghc-ghc,nkaretnikov/ghc,sdiehl/ghc,christiaanb/ghc,lukexi/ghc-7.8-arm64,spacekitteh/smcghc,snoyberg/ghc,sdiehl/ghc,mcschroeder/ghc,oldmanmike/ghc,ekmett/ghc,gridaphobe/ghc,fmthoma/ghc,nkaretnikov/ghc,nushio3/ghc,sdiehl/ghc,ml9951/ghc,lukexi/ghc,AlexanderPankiv/ghc,ryantm/ghc,siddhanathan/ghc,elieux/ghc,christiaanb/ghc,spacekitteh/smcghc,nathyong/microghc-ghc,ghc-android/ghc,elieux/ghc