vp9 register checks only apply to vp9
vp9 register checks only apply to vp9

Disable register checks when vp9 is not configured. Soon vp8 assembly
will move to intrinsics, obviating this check.

This will still run the check when vp9 is enabled.

Change-Id: I90f50d22cb8c15e9c07f2c8e830e08de7fce0689

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