Don't warn of duplicate exports in case of module exports.
Don't warn of duplicate exports in case of module exports.

But only when the module exports refer to different modules.
See ticket #4478.

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