vpxenc: Remove support for IVF input.
vpxenc: Remove support for IVF input.

Change-Id: Ida0e1b2df89e992b8140672b70517d8623cf9ede

gshORTON/webm.libvpx,hsueceumd/test_hui,WebRTC-Labs/libvpx,Maria1099/webm.libvpx,altogother/webm.libvpx,stewnorriss/libvpx,jdm/libvpx,pcwalton/libvpx,altogother/webm.libvpx,shareefalis/libvpx,Topopiccione/libvpx,running770/libvpx,matanbs/vp982,kim42083/webm.libvpx,ittiamvpx/libvpx-1,Maria1099/webm.libvpx,liqianggao/libvpx,mwgoldsmith/vpx,ittiamvpx/libvpx,jacklicn/webm.libvpx,turbulenz/libvpx,shacklettbp/aom,Laknot/libvpx,smarter/aom,GrokImageCompression/aom,Suvarna1488/webm.libvpx,Laknot/libvpx,kim42083/webm.libvpx,charup/https---github.com-webmproject-libvpx-,pcwalton/libvpx,reimaginemedia/webm.libvpx,matanbs/webm.libvpx,WebRTC-Labs/libvpx,VTCSecureLLC/libvpx,stewnorriss/libvpx,Topopiccione/libvpx,matanbs/vp982,running770/libvpx,felipebetancur/libvpx,matanbs/vp982,mwgoldsmith/vpx,mwgoldsmith/libvpx,iniwf/webm.libvpx,hsueceumd/test_hui,Laknot/libvpx,running770/libvpx,liqianggao/libvpx,stewnorriss/libvpx,Acidburn0zzz/webm.libvpx,n4t/libvpx,jdm/libvpx,openpeer/libvpx_new,ShiftMediaProject/libvpx,Acidburn0zzz/webm.libvpx,sanyaade-teachings/libvpx,turbulenz/libvpx,VTCSecureLLC/libvpx,n4t/libvpx,matanbs/vp982,matanbs/webm.libvpx,lyx2014/libvpx_c,kleopatra999/webm.libvpx,smarter/aom,ittiamvpx/libvpx-1,thdav/aom,mwgoldsmith/libvpx,stewnorriss/libvpx,iniwf/webm.libvpx,VTCSecureLLC/libvpx,altogother/webm.libvpx,altogother/webm.libvpx,zofuthan/libvpx,GrokImageCompression/aom,shyamalschandra/libvpx,webmproject/libvpx,lyx2014/libvpx_c,zofuthan/libvpx,stewnorriss/libvpx,matanbs/webm.libvpx,goodleixiao/vpx,liqianggao/libvpx,kleopatra999/webm.libvpx,matanbs/webm.libvpx,shyamalschandra/libvpx,jmvalin/aom,webmproject/libvpx,mwgoldsmith/vpx,ittiamvpx/libvpx,Topopiccione/libvpx,openpeer/libvpx_new,GrokImageCompression/aom,ShiftMediaProject/libvpx,turbulenz/libvpx,luctrudeau/aom,jacklicn/webm.libvpx,matanbs/vp982,kleopatra999/webm.libvpx,Suvarna1488/webm.libvpx,lyx2014/libvpx_c,VTCSecureLLC/libvpx,mwgoldsmith/vpx,mwgoldsmith/libvpx,running770/libvpx,pcwalton/libvpx,jmvalin/aom,jacklicn/webm.libvpx,shyamalschandra/libvpx,iniwf/webm.libvpx,kleopatra999/webm.libvpx,turbulenz/libvpx,jdm/libvpx,ittiamvpx/libvpx-1,mwgoldsmith/vpx,goodleixiao/vpx,kalli123/webm.libvpx,liqianggao/libvpx,gshORTON/webm.libvpx,GrokImageCompression/aom,turbulenz/libvpx,zofuthan/libvpx,turbulenz/libvpx,luctrudeau/aom,reimaginemedia/webm.libvpx,GrokImageCompression/aom,jmvalin/aom,mwgoldsmith/libvpx,Laknot/libvpx,charup/https---github.com-webmproject-libvpx-,jdm/libvpx,shareefalis/libvpx,hsueceumd/test_hui,thdav/aom,charup/https---github.com-webmproject-libvpx-,jmvalin/aom,smarter/aom,reimaginemedia/webm.libvpx,Acidburn0zzz/webm.libvpx,jacklicn/webm.libvpx,ittiamvpx/libvpx-1,ittiamvpx/libvpx-1,Distrotech/libvpx,sanyaade-teachings/libvpx,reimaginemedia/webm.libvpx,felipebetancur/libvpx,felipebetancur/libvpx,lyx2014/libvpx_c,kalli123/webm.libvpx,reimaginemedia/webm.libvpx,charup/https---github.com-webmproject-libvpx-,zofuthan/libvpx,jmvalin/aom,WebRTC-Labs/libvpx,smarter/aom,mbebenita/aom,gshORTON/webm.libvpx,Distrotech/libvpx,webmproject/libvpx,mbebenita/aom,pcwalton/libvpx,mbebenita/aom,jdm/libvpx,shacklettbp/aom,sanyaade-teachings/libvpx,Distrotech/libvpx,kalli123/webm.libvpx,shyamalschandra/libvpx,Acidburn0zzz/webm.libvpx,WebRTC-Labs/libvpx,VTCSecureLLC/libvpx,ittiamvpx/libvpx,shacklettbp/aom,kleopatra999/webm.libvpx,ittiamvpx/libvpx,matanbs/vp982,ShiftMediaProject/libvpx,abwiz0086/webm.libvpx,jdm/libvpx,kalli123/webm.libvpx,hsueceumd/test_hui,Laknot/libvpx,turbulenz/libvpx,running770/libvpx,thdav/aom,abwiz0086/webm.libvpx,kim42083/webm.libvpx,altogother/webm.libvpx,shacklettbp/aom,luctrudeau/aom,sanyaade-teachings/libvpx,kalli123/webm.libvpx,kim42083/webm.libvpx,mbebenita/aom,Suvarna1488/webm.libvpx,openpeer/libvpx_new,turbulenz/libvpx,abwiz0086/webm.libvpx,jacklicn/webm.libvpx,abwiz0086/webm.libvpx,luctrudeau/aom,n4t/libvpx,lyx2014/libvpx_c,webmproject/libvpx,shareefalis/libvpx,felipebetancur/libvpx,kim42083/webm.libvpx,charup/https---github.com-webmproject-libvpx-,felipebetancur/libvpx,thdav/aom,Topopiccione/libvpx,matanbs/vp982,running770/libvpx,iniwf/webm.libvpx,altogother/webm.libvpx,Suvarna1488/webm.libvpx,shareefalis/libvpx,Distrotech/libvpx,matanbs/webm.libvpx,openpeer/libvpx_new,webmproject/libvpx,openpeer/libvpx_new,pcwalton/libvpx,shacklettbp/aom,ittiamvpx/libvpx,abwiz0086/webm.libvpx,mbebenita/aom,hsueceumd/test_hui,jmvalin/aom,Distrotech/libvpx,goodleixiao/vpx,kleopatra999/webm.libvpx,kim42083/webm.libvpx,liqianggao/libvpx,ittiamvpx/libvpx-1,Distrotech/libvpx,iniwf/webm.libvpx,pcwalton/libvpx,charup/https---github.com-webmproject-libvpx-,goodleixiao/vpx,Suvarna1488/webm.libvpx,lyx2014/libvpx_c,stewnorriss/libvpx,abwiz0086/webm.libvpx,kalli123/webm.libvpx,gshORTON/webm.libvpx,openpeer/libvpx_new,Topopiccione/libvpx,turbulenz/libvpx,Maria1099/webm.libvpx,smarter/aom,gshORTON/webm.libvpx,goodleixiao/vpx,shyamalschandra/libvpx,Acidburn0zzz/webm.libvpx,Maria1099/webm.libvpx,zofuthan/libvpx,webmproject/libvpx,iniwf/webm.libvpx,Laknot/libvpx,shyamalschandra/libvpx,felipebetancur/libvpx,jacklicn/webm.libvpx,Maria1099/webm.libvpx,n4t/libvpx,luctrudeau/aom,Acidburn0zzz/webm.libvpx,Topopiccione/libvpx,matanbs/webm.libvpx,mbebenita/aom,luctrudeau/aom,mwgoldsmith/libvpx,thdav/aom,mwgoldsmith/libvpx,smarter/aom,hsueceumd/test_hui,shacklettbp/aom,shareefalis/libvpx,VTCSecureLLC/libvpx,WebRTC-Labs/libvpx,mbebenita/aom,n4t/libvpx,mbebenita/aom,zofuthan/libvpx,reimaginemedia/webm.libvpx,gshORTON/webm.libvpx,Maria1099/webm.libvpx,goodleixiao/vpx,GrokImageCompression/aom,thdav/aom,ShiftMediaProject/libvpx,ittiamvpx/libvpx,shareefalis/libvpx,sanyaade-teachings/libvpx,mbebenita/aom,ShiftMediaProject/libvpx,mwgoldsmith/vpx,liqianggao/libvpx,Suvarna1488/webm.libvpx