Use $(HC), not $(GHC) to compile ghc-inplace
Use $(HC), not $(GHC) to compile ghc-inplace

$(GHC) is always the installed compiler, $(HC) changes depending on
the stage.  This has the nice effect that we build stage2/ghc-inplace
using the stage1 compiler, and get to take advantage of bugfixes in
stage1 relative to $(GHC) (in particular I want the non-blocking stdin
fix for stage2, otherwise piping the testsuite output through tee
fails).

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