Make submodule sync silent (and recursive).
Make submodule sync silent (and recursive).

This eliminates the

    Synchronizing submodule url for 'support/android-rs-glue'
    Synchronizing submodule url for 'tests/wpt/web-platform-tests'

messages that appeared for every `mach build` command.

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