Update the appveyor file for 64bits builds
Update the appveyor file for 64bits builds

vvuk/glutin,ozkriff/glutin,vberger/glutin,mmatyas/glutin,notriddle/glutin,mbrubeck/glutin,paulrouget/glutin,bvssvni/glutin,mvdnes/glutin,robertknight/glutin,fkaa/glutin,adambadawy/glutin,TimNN/glutin,nc4rrillo/glutin,Ms2ger/glutin,christopheraugustus/glutin,mitchmindtree/glutin,Jayflux/glutin,tempbottle/glutin,retep998/glutin,servo/glutin,tomaka/winit,ecoal95/glutin,kornholi/glutin,nox/glutin,mneumann/glutin,mbrubeck/glutin,tomaka/glutin