Fix installing on Windows
Fix installing on Windows

nus in #ghc ran into a problem where the wrong filepath was being
stripped.

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