enable RTS opts for GHC 7.3+
enable RTS opts for GHC 7.3+

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