ghc-pkg: use read/writeUTF8File from Cabal
ghc-pkg: use read/writeUTF8File from Cabal

Use writeUTF8File and readUTF8File from Distribution.Simple.Utils,
instead of our own buggy copies. Refactoring only.

sdiehl/ghc,mettekou/ghc,GaloisInc/halvm-ghc,gridaphobe/ghc,snoyberg/ghc,sdiehl/ghc,urbanslug/ghc,olsner/ghc,urbanslug/ghc,mfine/ghc,gridaphobe/ghc,oldmanmike/ghc,mcschroeder/ghc,vikraman/ghc,shlevy/ghc,olsner/ghc,AlexanderPankiv/ghc,vTurbine/ghc,mcschroeder/ghc,acowley/ghc,urbanslug/ghc,wxwxwwxxx/ghc,TomMD/ghc,nushio3/ghc,wxwxwwxxx/ghc,acowley/ghc,mcschroeder/ghc,tjakway/ghcjvm,oldmanmike/ghc,tjakway/ghcjvm,ezyang/ghc,mettekou/ghc,vTurbine/ghc,ml9951/ghc,snoyberg/ghc,ghc-android/ghc,olsner/ghc,ezyang/ghc,GaloisInc/halvm-ghc,nushio3/ghc,snoyberg/ghc,nushio3/ghc,oldmanmike/ghc,elieux/ghc,sgillespie/ghc,oldmanmike/ghc,sdiehl/ghc,siddhanathan/ghc,elieux/ghc,gridaphobe/ghc,TomMD/ghc,shlevy/ghc,mettekou/ghc,vikraman/ghc,acowley/ghc,AlexanderPankiv/ghc,vTurbine/ghc,oldmanmike/ghc,wxwxwwxxx/ghc,anton-dessiatov/ghc,AlexanderPankiv/ghc,oldmanmike/ghc,wxwxwwxxx/ghc,mfine/ghc,da-x/ghc,da-x/ghc,mfine/ghc,nushio3/ghc,acowley/ghc,mfine/ghc,ghc-android/ghc,nkaretnikov/ghc,sgillespie/ghc,oldmanmike/ghc,urbanslug/ghc,vikraman/ghc,ghc-android/ghc,anton-dessiatov/ghc,ezyang/ghc,ezyang/ghc,GaloisInc/halvm-ghc,AlexanderPankiv/ghc,wxwxwwxxx/ghc,ml9951/ghc,elieux/ghc,tjakway/ghcjvm,sdiehl/ghc,mfine/ghc,urbanslug/ghc,ghc-android/ghc,mcschroeder/ghc,acowley/ghc,ghc-android/ghc,nkaretnikov/ghc,TomMD/ghc,urbanslug/ghc,sgillespie/ghc,olsner/ghc,wxwxwwxxx/ghc,mcschroeder/ghc,ml9951/ghc,vikraman/ghc,snoyberg/ghc,sgillespie/ghc,vikraman/ghc,anton-dessiatov/ghc,sdiehl/ghc,mfine/ghc,da-x/ghc,vTurbine/ghc,ml9951/ghc,nkaretnikov/ghc,urbanslug/ghc,snoyberg/ghc,gridaphobe/ghc,siddhanathan/ghc,mcschroeder/ghc,shlevy/ghc,elieux/ghc,AlexanderPankiv/ghc,AlexanderPankiv/ghc,tjakway/ghcjvm,nkaretnikov/ghc,mcschroeder/ghc,nushio3/ghc,anton-dessiatov/ghc,vTurbine/ghc,ezyang/ghc,mettekou/ghc,sdiehl/ghc,mettekou/ghc,vikraman/ghc,TomMD/ghc,GaloisInc/halvm-ghc,shlevy/ghc,gridaphobe/ghc,nkaretnikov/ghc,anton-dessiatov/ghc,wxwxwwxxx/ghc,tjakway/ghcjvm,ml9951/ghc,anton-dessiatov/ghc,siddhanathan/ghc,mettekou/ghc,nushio3/ghc,shlevy/ghc,sgillespie/ghc,siddhanathan/ghc,snoyberg/ghc,ezyang/ghc,vTurbine/ghc,siddhanathan/ghc,sdiehl/ghc,olsner/ghc,nushio3/ghc,gridaphobe/ghc,TomMD/ghc,vikraman/ghc,gridaphobe/ghc,anton-dessiatov/ghc,da-x/ghc,sgillespie/ghc,snoyberg/ghc,nkaretnikov/ghc,da-x/ghc,siddhanathan/ghc,TomMD/ghc,tjakway/ghcjvm,elieux/ghc,elieux/ghc,GaloisInc/halvm-ghc,mfine/ghc,acowley/ghc,TomMD/ghc,olsner/ghc,olsner/ghc,ml9951/ghc,elieux/ghc,da-x/ghc,GaloisInc/halvm-ghc,siddhanathan/ghc,vTurbine/ghc,da-x/ghc,tjakway/ghcjvm,ml9951/ghc,mettekou/ghc,shlevy/ghc,ghc-android/ghc,ghc-android/ghc,GaloisInc/halvm-ghc,sgillespie/ghc,acowley/ghc,shlevy/ghc,AlexanderPankiv/ghc,nkaretnikov/ghc,ml9951/ghc,ezyang/ghc