Add --enable-tree-rust to configure to build in-tree rust compiler
Add --enable-tree-rust to configure to build in-tree rust compiler

bjwbell/servo,echochamber/servo,nrc/servo,michaelwu/servo,j3parker/servo,GreenRecycleBin/servo,nnethercote/servo,larsbergstrom/servo,fiji-flo/servo,steveklabnik/servo,walac/servo,mbrubeck/servo,tempbottle/servo,ryancanhelpyou/servo,pgonda/servo,snf/servo,rnestler/servo,bfrohs/servo,splav/servo,sadmansk/servo,szeged/servo,nick-thompson/servo,saneyuki/servo,aweinstock314/servo,dhananjay92/servo,deokjinkim/servo,srbhklkrn/SERVOENGINE,runarberg/servo,tschneidereit/servo,WriterOfAlicrow/servo,canaltinova/servo,karlito40/servo,walac/servo,youprofit/servo,KiChjang/servo,walac/servo,bjwbell/servo,jimberlage/servo,mattnenterprise/servo,emilio/servo,notriddle/servo,sadmansk/servo,brendandahl/servo,kindersung/servo,larsbergstrom/servo,mdibaiee/servo,juzer10/servo,emilio/servo,bjwbell/servo,zhangjunlei26/servo,dvberkel/servo,zentner-kyle/servo,thiagopnts/servo,wpgallih/servo,CJ8664/servo,notriddle/servo,ryancanhelpyou/servo,KiChjang/servo,paulrouget/servo,paulrouget/servo,g-k/servo,deokjinkim/servo,ConnorGBrewster/servo,brendandahl/servo,evilpie/servo,jimberlage/servo,peterjoel/servo,ConnorGBrewster/servo,zhangjunlei26/servo,ruud-v-a/servo,rentongzhang/servo,steveklabnik/servo,indykish/servo,Adenilson/prototype-viewing-distance,mbrubeck/servo,aweinstock314/servo,luniv/servo,mdibaiee/servo,anthgur/servo,codemac/servo,michaelwu/servo,emilio/servo,saratang/servo,KiChjang/servo,splav/servo,ryancanhelpyou/servo,notriddle/servo,g-k/servo,splav/servo,rixrix/servo,SimonSapin/servo,rnestler/servo,mattnenterprise/servo,GreenRecycleBin/servo,A-deLuna/servo,pyfisch/servo,paulrouget/servo,fiji-flo/servo,CJ8664/servo,upsuper/servo,ConnorGBrewster/servo,dvberkel/servo,upsuper/servo,j3parker/servo,bfrohs/servo,tafia/servo,szeged/servo,larsbergstrom/servo,pgonda/servo,deokjinkim/servo,mt2d2/servo,jlegendary/servo,larsbergstrom/servo,ruud-v-a/servo,mbrubeck/servo,rentongzhang/servo,jimberlage/servo,jdramani/servo,upsuper/servo,WriterOfAlicrow/servo,cbrewster/servo,Shraddha512/servo,dhananjay92/servo,AnthonyBroadCrawford/servo,huonw/servo,upsuper/servo,echochamber/servo,nerith/servo,A-deLuna/servo,srbhklkrn/SERVOENGINE,samfoo/servo,pyfisch/servo,zhangjunlei26/servo,nrc/servo,CJ8664/servo,s142857/servo,aidanhs/servo,hyowon/servo,A-deLuna/servo,sadmansk/servo,youprofit/servo,upsuper/servo,RenaudParis/servo,nick-thompson/servo,zhangjunlei26/servo,avadacatavra/servo,szeged/servo,rentongzhang/servo,tafia/servo,jlegendary/servo,pgonda/servo,huonw/servo,CJ8664/servo,evilpie/servo,fiji-flo/servo,notriddle/servo,bfrohs/servo,snf/servo,AnthonyBroadCrawford/servo,KiChjang/servo,runarberg/servo,dvberkel/servo,g-k/servo,RenaudParis/servo,caldwell/servo,evilpie/servo,GyrosOfWar/servo,dhananjay92/servo,jdramani/servo,peterjoel/servo,froydnj/servo,dvberkel/servo,zentner-kyle/servo,mattnenterprise/servo,KiChjang/servo,boghison/servo,echochamber/servo,caldwell/servo,chotchki/servo,notriddle/servo,karlito40/servo,akosel/servo,paulrouget/servo,dmarcos/servo,g-k/servo,evilpie/servo,wartman4404/servo,dhananjay92/servo,meh/servo,emilio/servo,wpgallih/servo,nick-thompson/servo,CJ8664/servo,codemac/servo,steveklabnik/servo,dsandeephegde/servo,zhangjunlei26/servo,cbrewster/servo,jgraham/servo,dagnir/servo,j3parker/servo,A-deLuna/servo,s142857/servo,jgraham/servo,szeged/servo,ryancanhelpyou/servo,AnthonyBroadCrawford/servo,CJ8664/servo,sadmansk/servo,nick-thompson/servo,wartman4404/servo,boghison/servo,eddyb/servo,dsandeephegde/servo,wpgallih/servo,avadacatavra/servo,indykish/servo,indykish/servo,youprofit/servo,nnethercote/servo,dati91/servo,avadacatavra/servo,nick-thompson/servo,WriterOfAlicrow/servo,huonw/servo,notriddle/servo,tschneidereit/servo,jgraham/servo,tschneidereit/servo,indykish/servo,samfoo/servo,saratang/servo,wartman4404/servo,szeged/servo,dagnir/servo,steveklabnik/servo,pyfisch/servo,wartman4404/servo,nnethercote/servo,srbhklkrn/SERVOENGINE,canaltinova/servo,deokjinkim/servo,dmarcos/servo,bjwbell/servo,eddyb/servo,bfrohs/servo,nnethercote/servo,Shraddha512/servo,eddyb/servo,vks/servo,nrc/servo,evilpie/servo,echochamber/servo,pyfisch/servo,kindersung/servo,shrenikgala/servo,AnthonyBroadCrawford/servo,chotchki/servo,notriddle/servo,youprofit/servo,bjwbell/servo,tafia/servo,dvberkel/servo,peterjoel/servo,ConnorGBrewster/servo,mbrubeck/servo,jdramani/servo,indykish/servo,walac/servo,boghison/servo,zentner-kyle/servo,Shraddha512/servo,hyowon/servo,hyowon/servo,mukilan/servo,saratang/servo,froydnj/servo,tschneidereit/servo,wpgallih/servo,srbhklkrn/SERVOENGINE,peterjoel/servo,tafia/servo,anthgur/servo,emilio/servo,jimberlage/servo,boghison/servo,eddyb/servo,s142857/servo,j3parker/servo,samfoo/servo,tempbottle/servo,runarberg/servo,jdramani/servo,Adenilson/prototype-viewing-distance,juzer10/servo,nick-thompson/servo,jgraham/servo,luniv/servo,juzer10/servo,anthgur/servo,avadacatavra/servo,splav/servo,froydnj/servo,rnestler/servo,nnethercote/servo,splav/servo,dagnir/servo,saratang/servo,shrenikgala/servo,karlito40/servo,mukilan/servo,GreenRecycleBin/servo,samfoo/servo,jlegendary/servo,chotchki/servo,karlito40/servo,emilio/servo,codemac/servo,srbhklkrn/SERVOENGINE,snf/servo,GyrosOfWar/servo,caldwell/servo,meh/servo,kindersung/servo,echochamber/servo,aidanhs/servo,larsbergstrom/servo,jimberlage/servo,codemac/servo,sadmansk/servo,paulrouget/servo,fiji-flo/servo,mattnenterprise/servo,DominoTree/servo,paulrouget/servo,saneyuki/servo,rixrix/servo,hyowon/servo,notriddle/servo,nick-thompson/servo,SimonSapin/servo,sadmansk/servo,splav/servo,deokjinkim/servo,thiagopnts/servo,jdramani/servo,s142857/servo,aidanhs/servo,boghison/servo,splav/servo,caldwell/servo,jlegendary/servo,pyecs/servo,cbrewster/servo,ruud-v-a/servo,GreenRecycleBin/servo,steveklabnik/servo,jlegendary/servo,GyrosOfWar/servo,paulrouget/servo,pgonda/servo,GreenRecycleBin/servo,mbrubeck/servo,pyfisch/servo,rentongzhang/servo,thiagopnts/servo,ConnorGBrewster/servo,saratang/servo,ryancanhelpyou/servo,splav/servo,GyrosOfWar/servo,emilio/servo,Adenilson/prototype-viewing-distance,zentner-kyle/servo,jimberlage/servo,michaelwu/servo,GreenRecycleBin/servo,vks/servo,thiagopnts/servo,WriterOfAlicrow/servo,splav/servo,aidanhs/servo,GreenRecycleBin/servo,pyecs/servo,anthgur/servo,tafia/servo,tempbottle/servo,juzer10/servo,A-deLuna/servo,A-deLuna/servo,rixrix/servo,s142857/servo,hyowon/servo,Shraddha512/servo,DominoTree/servo,s142857/servo,luniv/servo,wpgallih/servo,indykish/servo,aweinstock314/servo,A-deLuna/servo,nnethercote/servo,mt2d2/servo,RenaudParis/servo,nnethercote/servo,DominoTree/servo,cbrewster/servo,mattnenterprise/servo,froydnj/servo,mukilan/servo,peterjoel/servo,wpgallih/servo,youprofit/servo,rixrix/servo,samfoo/servo,WriterOfAlicrow/servo,pyfisch/servo,mdibaiee/servo,meh/servo,canaltinova/servo,Adenilson/prototype-viewing-distance,RenaudParis/servo,KiChjang/servo,akosel/servo,mt2d2/servo,fiji-flo/servo,dhananjay92/servo,Adenilson/prototype-viewing-distance,peterjoel/servo,jlegendary/servo,snf/servo,SimonSapin/servo,pgonda/servo,rixrix/servo,larsbergstrom/servo,akosel/servo,DominoTree/servo,meh/servo,rnestler/servo,SimonSapin/servo,saneyuki/servo,canaltinova/servo,peterjoel/servo,shrenikgala/servo,runarberg/servo,saneyuki/servo,aweinstock314/servo,szeged/servo,rnestler/servo,larsbergstrom/servo,emilio/servo,kindersung/servo,tempbottle/servo,thiagopnts/servo,mdibaiee/servo,rixrix/servo,dati91/servo,akosel/servo,dmarcos/servo,jgraham/servo,echochamber/servo,avadacatavra/servo,CJ8664/servo,samfoo/servo,wpgallih/servo,jimberlage/servo,mbrubeck/servo,boghison/servo,jlegendary/servo,codemac/servo,tschneidereit/servo,thiagopnts/servo,dmarcos/servo,CJ8664/servo,eddyb/servo,GyrosOfWar/servo,szeged/servo,nnethercote/servo,eddyb/servo,mbrubeck/servo,j3parker/servo,rixrix/servo,pyecs/servo,aidanhs/servo,tempbottle/servo,juzer10/servo,szeged/servo,peterjoel/servo,michaelwu/servo,tafia/servo,tempbottle/servo,nerith/servo,akosel/servo,rnestler/servo,bjwbell/servo,nerith/servo,nrc/servo,runarberg/servo,canaltinova/servo,rentongzhang/servo,meh/servo,jimberlage/servo,caldwell/servo,Shraddha512/servo,emilio/servo,DominoTree/servo,mukilan/servo,AnthonyBroadCrawford/servo,saneyuki/servo,avadacatavra/servo,RenaudParis/servo,vks/servo,nnethercote/servo,pyecs/servo,ConnorGBrewster/servo,g-k/servo,srbhklkrn/SERVOENGINE,wartman4404/servo,SimonSapin/servo,indykish/servo,dvberkel/servo,thiagopnts/servo,nerith/servo,larsbergstrom/servo,rixrix/servo,dati91/servo,fiji-flo/servo,DominoTree/servo,zentner-kyle/servo,dati91/servo,evilpie/servo,DominoTree/servo,SimonSapin/servo,huonw/servo,zhangjunlei26/servo,pyfisch/servo,samfoo/servo,canaltinova/servo,saneyuki/servo,notriddle/servo,rnestler/servo,aidanhs/servo,luniv/servo,WriterOfAlicrow/servo,splav/servo,brendandahl/servo,brendandahl/servo,rentongzhang/servo,dsandeephegde/servo,RenaudParis/servo,snf/servo,deokjinkim/servo,mukilan/servo,j3parker/servo,SimonSapin/servo,Adenilson/prototype-viewing-distance,youprofit/servo,paulrouget/servo,luniv/servo,karlito40/servo,aweinstock314/servo,kindersung/servo,chotchki/servo,jdramani/servo,caldwell/servo,ruud-v-a/servo,pgonda/servo,szeged/servo,KiChjang/servo,aweinstock314/servo,dvberkel/servo,zhangjunlei26/servo,huonw/servo,fiji-flo/servo,eddyb/servo,echochamber/servo,pyecs/servo,pyecs/servo,saneyuki/servo,wpgallih/servo,saratang/servo,dagnir/servo,vks/servo,ConnorGBrewster/servo,indykish/servo,mukilan/servo,GyrosOfWar/servo,j3parker/servo,emilio/servo,sadmansk/servo,nrc/servo,luniv/servo,szeged/servo,anthgur/servo,karlito40/servo,vks/servo,paulrouget/servo,zhangjunlei26/servo,peterjoel/servo,steveklabnik/servo,avadacatavra/servo,shrenikgala/servo,brendandahl/servo,snf/servo,huonw/servo,GreenRecycleBin/servo,bfrohs/servo,DominoTree/servo,evilpie/servo,pgonda/servo,SimonSapin/servo,tafia/servo,fiji-flo/servo,youprofit/servo,mt2d2/servo,notriddle/servo,rentongzhang/servo,wartman4404/servo,anthgur/servo,Shraddha512/servo,mattnenterprise/servo,mt2d2/servo,cbrewster/servo,DominoTree/servo,GreenRecycleBin/servo,michaelwu/servo,dagnir/servo,tschneidereit/servo,jdramani/servo,mdibaiee/servo,ruud-v-a/servo,walac/servo,dati91/servo,bjwbell/servo,rnestler/servo,dhananjay92/servo,mdibaiee/servo,dsandeephegde/servo,mattnenterprise/servo,srbhklkrn/SERVOENGINE,hyowon/servo,dagnir/servo,AnthonyBroadCrawford/servo,vks/servo,evilpie/servo,canaltinova/servo,dsandeephegde/servo,nnethercote/servo,deokjinkim/servo,jgraham/servo,saneyuki/servo,codemac/servo,juzer10/servo,ConnorGBrewster/servo,WriterOfAlicrow/servo,luniv/servo,hyowon/servo,canaltinova/servo,karlito40/servo,tschneidereit/servo,g-k/servo,nrc/servo,mbrubeck/servo,bfrohs/servo,rixrix/servo,Adenilson/prototype-viewing-distance,cbrewster/servo,nrc/servo,meh/servo,upsuper/servo,saratang/servo,brendandahl/servo,walac/servo,ryancanhelpyou/servo,dsandeephegde/servo,Shraddha512/servo,s142857/servo,caldwell/servo,steveklabnik/servo,kindersung/servo,shrenikgala/servo,wartman4404/servo,anthgur/servo,larsbergstrom/servo,chotchki/servo,froydnj/servo,codemac/servo,zentner-kyle/servo,g-k/servo,indykish/servo,vks/servo,zentner-kyle/servo,pyecs/servo,mt2d2/servo,aidanhs/servo,saneyuki/servo,ryancanhelpyou/servo,dagnir/servo,pyfisch/servo,mdibaiee/servo,saneyuki/servo,juzer10/servo,ruud-v-a/servo,runarberg/servo,tempbottle/servo,nerith/servo,shrenikgala/servo,anthgur/servo,KiChjang/servo,sadmansk/servo,KiChjang/servo,dsandeephegde/servo,evilpie/servo,RenaudParis/servo,dsandeephegde/servo,dati91/servo,jimberlage/servo,aweinstock314/servo,KiChjang/servo,shrenikgala/servo,larsbergstrom/servo,cbrewster/servo,akosel/servo,walac/servo,nerith/servo,snf/servo,akosel/servo,eddyb/servo,upsuper/servo,thiagopnts/servo,zhangjunlei26/servo,wpgallih/servo,GyrosOfWar/servo,chotchki/servo,dmarcos/servo,dmarcos/servo,mt2d2/servo,kindersung/servo,froydnj/servo,dati91/servo,michaelwu/servo,dhananjay92/servo,mattnenterprise/servo,dati91/servo,dmarcos/servo,runarberg/servo,avadacatavra/servo,meh/servo,upsuper/servo,AnthonyBroadCrawford/servo,jgraham/servo,paulrouget/servo,boghison/servo,cbrewster/servo,nerith/servo,peterjoel/servo,brendandahl/servo,pyfisch/servo,DominoTree/servo,pyfisch/servo,huonw/servo