libvpx: Fix vp9 clang build.
libvpx: Fix vp9 clang build.

- UNINITIALIZED_IS_SAFE Macro triggers a warning in Clang for
  structs.

Change-Id: Ib02c82f1fede7826564e17ccb7171c6fb18b8e44

Acidburn0zzz/webm.libvpx,turbulenz/libvpx,mbebenita/aom,Maria1099/webm.libvpx,altogother/webm.libvpx,luctrudeau/aom,cinema6/libvpx,hsueceumd/test_hui,luctrudeau/aom,smarter/aom,stewnorriss/libvpx,gshORTON/webm.libvpx,n4t/libvpx,ittiamvpx/libvpx,kalli123/webm.libvpx,abwiz0086/webm.libvpx,matanbs/webm.libvpx,running770/libvpx,turbulenz/libvpx,Suvarna1488/webm.libvpx,cinema6/libvpx,lyx2014/libvpx_c,liqianggao/libvpx,charup/https---github.com-webmproject-libvpx-,thdav/aom,Acidburn0zzz/webm.libvpx,webmproject/libvpx,zofuthan/libvpx,matanbs/webm.libvpx,running770/libvpx,reimaginemedia/webm.libvpx,stewnorriss/libvpx,abwiz0086/webm.libvpx,Maria1099/webm.libvpx,shyamalschandra/libvpx,shareefalis/libvpx,shareefalis/libvpx,ittiamvpx/libvpx-1,jmvalin/aom,gshORTON/webm.libvpx,liqianggao/libvpx,GrokImageCompression/aom,vasilvv/esvp8,felipebetancur/libvpx,charup/https---github.com-webmproject-libvpx-,kalli123/webm.libvpx,sanyaade-teachings/libvpx,Laknot/libvpx,ittiamvpx/libvpx,WebRTC-Labs/libvpx,thdav/aom,lyx2014/libvpx_c,jmvalin/aom,cinema6/libvpx,running770/libvpx,felipebetancur/libvpx,zofuthan/libvpx,matanbs/webm.libvpx,Laknot/libvpx,Distrotech/libvpx,mwgoldsmith/vpx,cinema6/libvpx,mbebenita/aom,zofuthan/libvpx,Suvarna1488/webm.libvpx,stewnorriss/libvpx,turbulenz/libvpx,felipebetancur/libvpx,Topopiccione/libvpx,liqianggao/libvpx,sanyaade-teachings/libvpx,Distrotech/libvpx,reimaginemedia/webm.libvpx,iniwf/webm.libvpx,shyamalschandra/libvpx,iniwf/webm.libvpx,matanbs/webm.libvpx,Suvarna1488/webm.libvpx,mbebenita/aom,charup/https---github.com-webmproject-libvpx-,Acidburn0zzz/webm.libvpx,Distrotech/libvpx,iniwf/webm.libvpx,webmproject/libvpx,shyamalschandra/libvpx,ShiftMediaProject/libvpx,mwgoldsmith/libvpx,shareefalis/libvpx,smarter/aom,charup/https---github.com-webmproject-libvpx-,jacklicn/webm.libvpx,kalli123/webm.libvpx,abwiz0086/webm.libvpx,Topopiccione/libvpx,openpeer/libvpx_new,vasilvv/esvp8,shacklettbp/aom,WebRTC-Labs/libvpx,webmproject/libvpx,mwgoldsmith/libvpx,jdm/libvpx,n4t/libvpx,shyamalschandra/libvpx,openpeer/libvpx_new,smarter/aom,vasilvv/esvp8,gshORTON/webm.libvpx,ShiftMediaProject/libvpx,ittiamvpx/libvpx,jacklicn/webm.libvpx,shacklettbp/aom,charup/https---github.com-webmproject-libvpx-,VTCSecureLLC/libvpx,kleopatra999/webm.libvpx,openpeer/libvpx_new,kim42083/webm.libvpx,matanbs/vp982,openpeer/libvpx_new,matanbs/vp982,running770/libvpx,ShiftMediaProject/libvpx,Topopiccione/libvpx,abwiz0086/webm.libvpx,pcwalton/libvpx,gshORTON/webm.libvpx,WebRTC-Labs/libvpx,hsueceumd/test_hui,jmvalin/aom,luctrudeau/aom,turbulenz/libvpx,ittiamvpx/libvpx-1,lyx2014/libvpx_c,shacklettbp/aom,Suvarna1488/webm.libvpx,ShiftMediaProject/libvpx,gshORTON/webm.libvpx,liqianggao/libvpx,vasilvv/esvp8,matanbs/webm.libvpx,pcwalton/libvpx,ittiamvpx/libvpx,hsueceumd/test_hui,vasilvv/esvp8,turbulenz/libvpx,mwgoldsmith/libvpx,stewnorriss/libvpx,n4t/libvpx,kalli123/webm.libvpx,Distrotech/libvpx,liqianggao/libvpx,openpeer/libvpx_new,abwiz0086/webm.libvpx,running770/libvpx,Suvarna1488/webm.libvpx,cinema6/libvpx,thdav/aom,goodleixiao/vpx,altogother/webm.libvpx,openpeer/libvpx_new,jdm/libvpx,kim42083/webm.libvpx,matanbs/vp982,matanbs/vp982,shacklettbp/aom,jmvalin/aom,shyamalschandra/libvpx,goodleixiao/vpx,VTCSecureLLC/libvpx,kleopatra999/webm.libvpx,shacklettbp/aom,matanbs/webm.libvpx,Distrotech/libvpx,iniwf/webm.libvpx,kleopatra999/webm.libvpx,GrokImageCompression/aom,felipebetancur/libvpx,kleopatra999/webm.libvpx,stewnorriss/libvpx,lyx2014/libvpx_c,cinema6/libvpx,felipebetancur/libvpx,jdm/libvpx,sanyaade-teachings/libvpx,goodleixiao/vpx,iniwf/webm.libvpx,luctrudeau/aom,mbebenita/aom,matanbs/vp982,kim42083/webm.libvpx,turbulenz/libvpx,pcwalton/libvpx,kim42083/webm.libvpx,jacklicn/webm.libvpx,smarter/aom,kleopatra999/webm.libvpx,reimaginemedia/webm.libvpx,mbebenita/aom,kim42083/webm.libvpx,mwgoldsmith/vpx,Laknot/libvpx,ShiftMediaProject/libvpx,Acidburn0zzz/webm.libvpx,mwgoldsmith/libvpx,goodleixiao/vpx,turbulenz/libvpx,mbebenita/aom,felipebetancur/libvpx,GrokImageCompression/aom,kalli123/webm.libvpx,cinema6/libvpx,zofuthan/libvpx,kalli123/webm.libvpx,thdav/aom,Acidburn0zzz/webm.libvpx,GrokImageCompression/aom,iniwf/webm.libvpx,WebRTC-Labs/libvpx,matanbs/vp982,liqianggao/libvpx,reimaginemedia/webm.libvpx,thdav/aom,webmproject/libvpx,jdm/libvpx,GrokImageCompression/aom,n4t/libvpx,shacklettbp/aom,zofuthan/libvpx,Maria1099/webm.libvpx,stewnorriss/libvpx,altogother/webm.libvpx,kim42083/webm.libvpx,jacklicn/webm.libvpx,VTCSecureLLC/libvpx,ittiamvpx/libvpx-1,jacklicn/webm.libvpx,gshORTON/webm.libvpx,luctrudeau/aom,abwiz0086/webm.libvpx,webmproject/libvpx,Suvarna1488/webm.libvpx,running770/libvpx,mbebenita/aom,hsueceumd/test_hui,goodleixiao/vpx,charup/https---github.com-webmproject-libvpx-,Topopiccione/libvpx,Topopiccione/libvpx,shyamalschandra/libvpx,Maria1099/webm.libvpx,lyx2014/libvpx_c,mwgoldsmith/libvpx,ittiamvpx/libvpx-1,pcwalton/libvpx,pcwalton/libvpx,mwgoldsmith/vpx,zofuthan/libvpx,reimaginemedia/webm.libvpx,jdm/libvpx,vasilvv/esvp8,ittiamvpx/libvpx,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