Remove unused CTAGS from build system
Remove unused CTAGS from build system

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