Fixed warnings in parser/Lexer.x
Fixed warnings in parser/Lexer.x

The -w flag can not be removed, because alex also generates code with lots of warnings.

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