Fix UnicodeDecodeError in mach clean-nightlies
Fix UnicodeDecodeError in mach clean-nightlies

anthgur/servo,thiagopnts/servo,jimberlage/servo,upsuper/servo,avadacatavra/servo,CJ8664/servo,anthgur/servo,sadmansk/servo,cbrewster/servo,pyfisch/servo,CJ8664/servo,sadmansk/servo,emilio/servo,KiChjang/servo,dati91/servo,peterjoel/servo,avadacatavra/servo,DominoTree/servo,mattnenterprise/servo,fiji-flo/servo,fiji-flo/servo,jimberlage/servo,mbrubeck/servo,larsbergstrom/servo,ConnorGBrewster/servo,ConnorGBrewster/servo,KiChjang/servo,peterjoel/servo,splav/servo,paulrouget/servo,eddyb/servo,KiChjang/servo,mattnenterprise/servo,saneyuki/servo,ConnorGBrewster/servo,nnethercote/servo,KiChjang/servo,SimonSapin/servo,canaltinova/servo,cbrewster/servo,jimberlage/servo,DominoTree/servo,pyfisch/servo,mbrubeck/servo,anthgur/servo,cbrewster/servo,mbrubeck/servo,szeged/servo,CJ8664/servo,larsbergstrom/servo,splav/servo,splav/servo,eddyb/servo,emilio/servo,paulrouget/servo,dsandeephegde/servo,emilio/servo,dati91/servo,nnethercote/servo,CJ8664/servo,nnethercote/servo,jimberlage/servo,saneyuki/servo,rnestler/servo,mattnenterprise/servo,CJ8664/servo,SimonSapin/servo,canaltinova/servo,emilio/servo,peterjoel/servo,eddyb/servo,eddyb/servo,ConnorGBrewster/servo,canaltinova/servo,peterjoel/servo,DominoTree/servo,DominoTree/servo,upsuper/servo,notriddle/servo,saneyuki/servo,CJ8664/servo,sadmansk/servo,peterjoel/servo,nnethercote/servo,paulrouget/servo,SimonSapin/servo,saneyuki/servo,thiagopnts/servo,upsuper/servo,rnestler/servo,rnestler/servo,fiji-flo/servo,notriddle/servo,pyfisch/servo,mattnenterprise/servo,CJ8664/servo,larsbergstrom/servo,notriddle/servo,rnestler/servo,paulrouget/servo,pyfisch/servo,dsandeephegde/servo,avadacatavra/servo,canaltinova/servo,szeged/servo,DominoTree/servo,jimberlage/servo,pyfisch/servo,szeged/servo,mbrubeck/servo,dati91/servo,ConnorGBrewster/servo,larsbergstrom/servo,nnethercote/servo,cbrewster/servo,dati91/servo,mattnenterprise/servo,peterjoel/servo,dati91/servo,mbrubeck/servo,emilio/servo,avadacatavra/servo,cbrewster/servo,dsandeephegde/servo,rnestler/servo,sadmansk/servo,saneyuki/servo,KiChjang/servo,dsandeephegde/servo,notriddle/servo,rnestler/servo,saneyuki/servo,notriddle/servo,dsandeephegde/servo,canaltinova/servo,emilio/servo,fiji-flo/servo,splav/servo,nnethercote/servo,peterjoel/servo,pyfisch/servo,peterjoel/servo,szeged/servo,szeged/servo,mattnenterprise/servo,nnethercote/servo,emilio/servo,mattnenterprise/servo,cbrewster/servo,splav/servo,CJ8664/servo,larsbergstrom/servo,cbrewster/servo,mattnenterprise/servo,dsandeephegde/servo,saneyuki/servo,pyfisch/servo,paulrouget/servo,emilio/servo,upsuper/servo,mbrubeck/servo,rnestler/servo,larsbergstrom/servo,thiagopnts/servo,canaltinova/servo,canaltinova/servo,larsbergstrom/servo,KiChjang/servo,avadacatavra/servo,nnethercote/servo,nnethercote/servo,anthgur/servo,jimberlage/servo,DominoTree/servo,saneyuki/servo,upsuper/servo,anthgur/servo,KiChjang/servo,ConnorGBrewster/servo,rnestler/servo,pyfisch/servo,saneyuki/servo,notriddle/servo,nnethercote/servo,upsuper/servo,pyfisch/servo,fiji-flo/servo,SimonSapin/servo,peterjoel/servo,sadmansk/servo,mbrubeck/servo,KiChjang/servo,splav/servo,jimberlage/servo,anthgur/servo,eddyb/servo,jimberlage/servo,paulrouget/servo,KiChjang/servo,thiagopnts/servo,SimonSapin/servo,DominoTree/servo,szeged/servo,larsbergstrom/servo,cbrewster/servo,splav/servo,saneyuki/servo,ConnorGBrewster/servo,DominoTree/servo,thiagopnts/servo,SimonSapin/servo,notriddle/servo,paulrouget/servo,upsuper/servo,eddyb/servo,paulrouget/servo,splav/servo,SimonSapin/servo,jimberlage/servo,pyfisch/servo,sadmansk/servo,upsuper/servo,KiChjang/servo,avadacatavra/servo,paulrouget/servo,eddyb/servo,canaltinova/servo,sadmansk/servo,fiji-flo/servo,DominoTree/servo,emilio/servo,szeged/servo,szeged/servo,DominoTree/servo,szeged/servo,thiagopnts/servo,anthgur/servo,ConnorGBrewster/servo,larsbergstrom/servo,dsandeephegde/servo,dati91/servo,notriddle/servo,larsbergstrom/servo,szeged/servo,splav/servo,fiji-flo/servo,anthgur/servo,eddyb/servo,avadacatavra/servo,splav/servo,paulrouget/servo,mbrubeck/servo,SimonSapin/servo,dsandeephegde/servo,avadacatavra/servo,thiagopnts/servo,sadmansk/servo,emilio/servo,dati91/servo,notriddle/servo,thiagopnts/servo,peterjoel/servo,fiji-flo/servo,notriddle/servo,dati91/servo