Fix issues with finding llvm tools again (#7661).
Fix issues with finding llvm tools again (#7661).

Patch modified from one by Karel Gardas <karel.gardas@centrum.cz>.

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