Add appveyor dependencies for ffmpeg
Add appveyor dependencies for ffmpeg

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