Fix the build on Windows
Fix the build on Windows

WhatGccIsCalled was no longer being defined on Windows.
Spotted by Niklas Larsson.

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