Fix build on Windows
Fix build on Windows

gcc couldn't find ghc_boot_platform.h. I'm not sure why it worked on
Linux.

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