configure: Prevent in-tree builds
configure: Prevent in-tree builds

Fixes #251.

thiagopnts/servo,ConnorGBrewster/servo,GyrosOfWar/servo,saratang/servo,canaltinova/servo,avadacatavra/servo,dmarcos/servo,michaelwu/servo,g-k/servo,mdibaiee/servo,Aalhad/CanvasRenderingContext2DMozilla,mukilan/servo,A-deLuna/servo,steveklabnik/servo,emilio/servo,upsuper/servo,dati91/servo,tafia/servo,juzer10/servo,dhananjay92/servo,mbrubeck/servo,dhananjay92/servo,eddyb/servo,canaltinova/servo,thiagopnts/servo,walac/servo,upsuper/servo,GreenRecycleBin/servo,nick-thompson/servo,walac/servo,jgraham/servo,larsbergstrom/servo,vks/servo,emilio/servo,dmarcos/servo,mdibaiee/servo,saneyuki/servo,dsandeephegde/servo,szeged/servo,DominoTree/servo,luniv/servo,jimberlage/servo,mattnenterprise/servo,evilpie/servo,mrobinson/servo,SimonSapin/servo,deokjinkim/servo,KiChjang/servo,luniv/servo,mukilan/servo,echochamber/servo,peterjoel/servo,AnthonyBroadCrawford/servo,szeged/servo,szeged/servo,aidanhs/servo,indykish/servo,huonw/servo,shrenikgala/servo,dati91/servo,CJ8664/servo,dagnir/servo,nnethercote/servo,canaltinova/servo,thiagopnts/servo,pyecs/servo,zentner-kyle/servo,SimonSapin/servo,zentner-kyle/servo,paulrouget/servo,shrenikgala/servo,KiChjang/servo,zentner-kyle/servo,youprofit/servo,CJ8664/servo,WriterOfAlicrow/servo,Shraddha512/servo,ryancanhelpyou/servo,canaltinova/servo,akosel/servo,SimonSapin/servo,tschneidereit/servo,anthgur/servo,DominoTree/servo,srbhklkrn/SERVOENGINE,rentongzhang/servo,emilio/servo,GyrosOfWar/servo,chotchki/servo,vks/servo,aidanhs/servo,pyfisch/servo,dsandeephegde/servo,zentner-kyle/servo,g-k/servo,dvberkel/servo,tschneidereit/servo,RenaudParis/servo,aweinstock314/servo,g-k/servo,mukilan/servo,jdramani/servo,echochamber/servo,vks/servo,bjwbell/servo,mt2d2/servo,ryancanhelpyou/servo,huonw/servo,rnestler/servo,GreenRecycleBin/servo,anthgur/servo,notriddle/servo,rnestler/servo,splav/servo,dmarcos/servo,aidanhs/servo,dvberkel/servo,nrc/servo,echochamber/servo,saneyuki/servo,dhananjay92/servo,avadacatavra/servo,sadmansk/servo,dsandeephegde/servo,meh/servo,GreenRecycleBin/servo,mattnenterprise/servo,samfoo/servo,samfoo/servo,jimberlage/servo,paulrouget/servo,pyecs/servo,jgraham/servo,mdibaiee/servo,hyowon/servo,thiagopnts/servo,indykish/servo,kindersung/servo,SimonSapin/servo,GyrosOfWar/servo,tafia/servo,notriddle/servo,echochamber/servo,nerith/servo,hyowon/servo,zhangjunlei26/servo,pyfisch/servo,evilpie/servo,jimberlage/servo,dmarcos/servo,sadmansk/servo,froydnj/servo,mdibaiee/servo,SimonSapin/servo,nrc/servo,avadacatavra/servo,RenaudParis/servo,mattnenterprise/servo,aidanhs/servo,WriterOfAlicrow/servo,owaspjocur/servo,codemac/servo,codemac/servo,nerith/servo,rnestler/servo,nrc/servo,eddyb/servo,ruud-v-a/servo,juzer10/servo,j3parker/servo,dagnir/servo,thiagopnts/servo,youprofit/servo,vks/servo,nick-thompson/servo,saneyuki/servo,snf/servo,splav/servo,tempbottle/servo,echochamber/servo,paulrouget/servo,wpgallih/servo,codemac/servo,caldwell/servo,luniv/servo,mbrubeck/servo,echochamber/servo,deokjinkim/servo,brendandahl/servo,seanmonstar/servo,rixrix/servo,akosel/servo,sadmansk/servo,eddyb/servo,mt2d2/servo,eddyb/servo,froydnj/servo,upsuper/servo,bjwbell/servo,aidanhs/servo,s142857/servo,szeged/servo,mrobinson/servo,bjwbell/servo,emilio/servo,snf/servo,cbrewster/servo,CJ8664/servo,zhangjunlei26/servo,Shraddha512/servo,srbhklkrn/SERVOENGINE,A-deLuna/servo,metajack/servo,notriddle/servo,nick-thompson/servo,chotchki/servo,notriddle/servo,jdramani/servo,sadmansk/servo,zhangjunlei26/servo,GyrosOfWar/servo,anthgur/servo,boghison/servo,WriterOfAlicrow/servo,pgonda/servo,fiji-flo/servo,DominoTree/servo,jlegendary/servo,Adenilson/prototype-viewing-distance,kindersung/servo,DominoTree/servo,pyecs/servo,chotchki/servo,meh/servo,ruud-v-a/servo,saneyuki/servo,emilio/servo,splav/servo,mukilan/servo,froydnj/servo,dmarcos/servo,codemac/servo,GreenRecycleBin/servo,peterjoel/servo,RenaudParis/servo,Shraddha512/servo,WriterOfAlicrow/servo,paulrouget/servo,KiChjang/servo,SimonSapin/servo,splav/servo,froydnj/servo,kindersung/servo,szeged/servo,indykish/servo,fiji-flo/servo,michaelwu/servo,splav/servo,GreenRecycleBin/servo,kindersung/servo,KiChjang/servo,pgonda/servo,paulrouget/servo,mbrubeck/servo,AnthonyBroadCrawford/servo,mbrubeck/servo,ConnorGBrewster/servo,jgraham/servo,samfoo/servo,huonw/servo,indykish/servo,nick-thompson/servo,pgonda/servo,zentner-kyle/servo,rixrix/servo,metajack/servo,jlegendary/servo,tafia/servo,g-k/servo,jgraham/servo,bfrohs/servo,RenaudParis/servo,dvberkel/servo,dhananjay92/servo,RenaudParis/servo,bfrohs/servo,eddyb/servo,dsandeephegde/servo,karlito40/servo,snf/servo,larsbergstrom/servo,karlito40/servo,splav/servo,saneyuki/servo,larsbergstrom/servo,bjwbell/servo,aweinstock314/servo,Adenilson/prototype-viewing-distance,hyowon/servo,youprofit/servo,mbrubeck/servo,dati91/servo,caldwell/servo,meh/servo,KiChjang/servo,s142857/servo,wpgallih/servo,ConnorGBrewster/servo,saneyuki/servo,runarberg/servo,emilio/servo,nnethercote/servo,dati91/servo,s142857/servo,meh/servo,ConnorGBrewster/servo,CJ8664/servo,mukilan/servo,caldwell/servo,metajack/servo,luniv/servo,CJ8664/servo,wartman4404/servo,wpgallih/servo,shrenikgala/servo,nnethercote/servo,nrc/servo,thiagopnts/servo,fiji-flo/servo,jlegendary/servo,sadmansk/servo,mattnenterprise/servo,karlito40/servo,nrc/servo,rixrix/servo,fiji-flo/servo,runarberg/servo,rentongzhang/servo,nrc/servo,paulrouget/servo,sadmansk/servo,jimberlage/servo,dati91/servo,thiagopnts/servo,anthgur/servo,tschneidereit/servo,jgraham/servo,ryancanhelpyou/servo,ConnorGBrewster/servo,avadacatavra/servo,tschneidereit/servo,steveklabnik/servo,fiji-flo/servo,tafia/servo,bfrohs/servo,Adenilson/prototype-viewing-distance,jlegendary/servo,kindersung/servo,nick-thompson/servo,evilpie/servo,ryancanhelpyou/servo,zhangjunlei26/servo,GyrosOfWar/servo,seanmonstar/servo,paulrouget/servo,j3parker/servo,brendandahl/servo,runarberg/servo,zentner-kyle/servo,akosel/servo,Aalhad/CanvasRenderingContext2DMozilla,A-deLuna/servo,larsbergstrom/servo,paulrouget/servo,ryancanhelpyou/servo,caldwell/servo,evilpie/servo,tschneidereit/servo,huonw/servo,srbhklkrn/SERVOENGINE,snf/servo,pyfisch/servo,j3parker/servo,jimberlage/servo,srbhklkrn/SERVOENGINE,meh/servo,CJ8664/servo,juzer10/servo,evilpie/servo,fiji-flo/servo,snf/servo,peterjoel/servo,metajack/servo,chotchki/servo,caldwell/servo,chotchki/servo,nerith/servo,dati91/servo,zhangjunlei26/servo,notriddle/servo,owaspjocur/servo,brendandahl/servo,ConnorGBrewster/servo,splav/servo,mdibaiee/servo,jgraham/servo,emilio/servo,dmarcos/servo,jdramani/servo,Adenilson/prototype-viewing-distance,wpgallih/servo,cbrewster/servo,g-k/servo,vks/servo,dagnir/servo,mt2d2/servo,deokjinkim/servo,juzer10/servo,pgonda/servo,mdibaiee/servo,SimonSapin/servo,wartman4404/servo,AnthonyBroadCrawford/servo,rnestler/servo,boghison/servo,nnethercote/servo,meh/servo,indykish/servo,splav/servo,dvberkel/servo,sadmansk/servo,michaelwu/servo,steveklabnik/servo,huonw/servo,A-deLuna/servo,dagnir/servo,evilpie/servo,youprofit/servo,dagnir/servo,jdramani/servo,AnthonyBroadCrawford/servo,KiChjang/servo,hyowon/servo,nerith/servo,RenaudParis/servo,tafia/servo,deokjinkim/servo,nnethercote/servo,Aalhad/CanvasRenderingContext2DMozilla,rentongzhang/servo,s142857/servo,deokjinkim/servo,tafia/servo,pyfisch/servo,mt2d2/servo,s142857/servo,dati91/servo,froydnj/servo,mbrubeck/servo,A-deLuna/servo,mt2d2/servo,WriterOfAlicrow/servo,walac/servo,j3parker/servo,jlegendary/servo,pyecs/servo,luniv/servo,peterjoel/servo,larsbergstrom/servo,steveklabnik/servo,bjwbell/servo,KiChjang/servo,AnthonyBroadCrawford/servo,chotchki/servo,caldwell/servo,AnthonyBroadCrawford/servo,pyecs/servo,jimberlage/servo,luniv/servo,dhananjay92/servo,bfrohs/servo,rixrix/servo,saratang/servo,pyfisch/servo,seanmonstar/servo,steveklabnik/servo,steveklabnik/servo,zentner-kyle/servo,KiChjang/servo,s142857/servo,owaspjocur/servo,nnethercote/servo,srbhklkrn/SERVOENGINE,tempbottle/servo,juzer10/servo,akosel/servo,jimberlage/servo,CJ8664/servo,karlito40/servo,larsbergstrom/servo,samfoo/servo,rnestler/servo,tschneidereit/servo,snf/servo,nnethercote/servo,cbrewster/servo,Aalhad/CanvasRenderingContext2DMozilla,peterjoel/servo,youprofit/servo,dvberkel/servo,notriddle/servo,steveklabnik/servo,nrc/servo,avadacatavra/servo,brendandahl/servo,Aalhad/CanvasRenderingContext2DMozilla,zhangjunlei26/servo,brendandahl/servo,ruud-v-a/servo,nick-thompson/servo,aidanhs/servo,wartman4404/servo,canaltinova/servo,rixrix/servo,echochamber/servo,rentongzhang/servo,mrobinson/servo,nerith/servo,walac/servo,froydnj/servo,fiji-flo/servo,ConnorGBrewster/servo,saratang/servo,szeged/servo,rixrix/servo,RenaudParis/servo,peterjoel/servo,owaspjocur/servo,metajack/servo,owaspjocur/servo,splav/servo,dhananjay92/servo,dagnir/servo,vks/servo,karlito40/servo,paulrouget/servo,anthgur/servo,rnestler/servo,splav/servo,aidanhs/servo,tempbottle/servo,eddyb/servo,jlegendary/servo,g-k/servo,michaelwu/servo,nerith/servo,DominoTree/servo,aweinstock314/servo,hyowon/servo,saratang/servo,AnthonyBroadCrawford/servo,saratang/servo,Adenilson/prototype-viewing-distance,saneyuki/servo,seanmonstar/servo,CJ8664/servo,rentongzhang/servo,nick-thompson/servo,jdramani/servo,vks/servo,cbrewster/servo,codemac/servo,ryancanhelpyou/servo,michaelwu/servo,mukilan/servo,notriddle/servo,bjwbell/servo,shrenikgala/servo,rentongzhang/servo,szeged/servo,Adenilson/prototype-viewing-distance,shrenikgala/servo,karlito40/servo,mattnenterprise/servo,shrenikgala/servo,mrobinson/servo,bjwbell/servo,fiji-flo/servo,ruud-v-a/servo,mattnenterprise/servo,jgraham/servo,zhangjunlei26/servo,szeged/servo,boghison/servo,Shraddha512/servo,s142857/servo,runarberg/servo,pyfisch/servo,rixrix/servo,Aalhad/CanvasRenderingContext2DMozilla,paulrouget/servo,notriddle/servo,saneyuki/servo,saratang/servo,mdibaiee/servo,akosel/servo,tempbottle/servo,boghison/servo,dsandeephegde/servo,SimonSapin/servo,rnestler/servo,michaelwu/servo,luniv/servo,deokjinkim/servo,tempbottle/servo,nnethercote/servo,thiagopnts/servo,DominoTree/servo,aweinstock314/servo,A-deLuna/servo,GreenRecycleBin/servo,pyfisch/servo,canaltinova/servo,j3parker/servo,avadacatavra/servo,GreenRecycleBin/servo,meh/servo,emilio/servo,mattnenterprise/servo,aweinstock314/servo,cbrewster/servo,larsbergstrom/servo,ryancanhelpyou/servo,upsuper/servo,upsuper/servo,cbrewster/servo,hyowon/servo,deokjinkim/servo,akosel/servo,cbrewster/servo,dmarcos/servo,seanmonstar/servo,Shraddha512/servo,GyrosOfWar/servo,canaltinova/servo,cbrewster/servo,saratang/servo,kindersung/servo,pgonda/servo,notriddle/servo,runarberg/servo,samfoo/servo,wpgallih/servo,anthgur/servo,peterjoel/servo,hyowon/servo,wartman4404/servo,pyfisch/servo,wpgallih/servo,boghison/servo,samfoo/servo,avadacatavra/servo,tafia/servo,dsandeephegde/servo,GyrosOfWar/servo,sadmansk/servo,DominoTree/servo,mbrubeck/servo,eddyb/servo,wartman4404/servo,karlito40/servo,upsuper/servo,codemac/servo,rixrix/servo,nnethercote/servo,pyfisch/servo,dsandeephegde/servo,wpgallih/servo,szeged/servo,jimberlage/servo,walac/servo,ConnorGBrewster/servo,youprofit/servo,WriterOfAlicrow/servo,rixrix/servo,pgonda/servo,runarberg/servo,aweinstock314/servo,brendandahl/servo,dsandeephegde/servo,boghison/servo,seanmonstar/servo,owaspjocur/servo,jlegendary/servo,mrobinson/servo,dagnir/servo,juzer10/servo,DominoTree/servo,huonw/servo,walac/servo,jdramani/servo,WriterOfAlicrow/servo,mt2d2/servo,indykish/servo,dvberkel/servo,mattnenterprise/servo,KiChjang/servo,tempbottle/servo,j3parker/servo,peterjoel/servo,canaltinova/servo,srbhklkrn/SERVOENGINE,evilpie/servo,Shraddha512/servo,huonw/servo,walac/servo,indykish/servo,ruud-v-a/servo,srbhklkrn/SERVOENGINE,nnethercote/servo,tempbottle/servo,pgonda/servo,nerith/servo,mbrubeck/servo,saneyuki/servo,mt2d2/servo,snf/servo,larsbergstrom/servo,A-deLuna/servo,evilpie/servo,wartman4404/servo,mrobinson/servo,shrenikgala/servo,wartman4404/servo,DominoTree/servo,jdramani/servo,Shraddha512/servo,j3parker/servo,Adenilson/prototype-viewing-distance,samfoo/servo,emilio/servo,indykish/servo,KiChjang/servo,caldwell/servo,juzer10/servo,bfrohs/servo,runarberg/servo,akosel/servo,upsuper/servo,pyecs/servo,tschneidereit/servo,indykish/servo,peterjoel/servo,ruud-v-a/servo,notriddle/servo,bfrohs/servo,kindersung/servo,anthgur/servo,rnestler/servo,eddyb/servo,zhangjunlei26/servo,saneyuki/servo,avadacatavra/servo,GreenRecycleBin/servo,pyecs/servo,zhangjunlei26/servo,codemac/servo,brendandahl/servo,dvberkel/servo,emilio/servo,DominoTree/servo,youprofit/servo,dati91/servo,g-k/servo,wpgallih/servo,metajack/servo,larsbergstrom/servo,peterjoel/servo,wpgallih/servo,dhananjay92/servo,boghison/servo,rentongzhang/servo,aweinstock314/servo,anthgur/servo,evilpie/servo,pyfisch/servo,larsbergstrom/servo,GreenRecycleBin/servo,szeged/servo,jimberlage/servo,upsuper/servo