Fix configure issue with unit test add. 
Fix configure issue with unit test add. 

Change-Id: I960c6eb81f8d76c958e8af989700447f581a8812

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rriss/libvpx,cinema6/libvpx,Laknot/libvpx,WebRTC-Labs/libvpx,webmproject/libvpx,zofuthan/libvpx,kim42083/webm.libvpx,Suvarna1488/webm.libvpx,reimaginemedia/webm.libvpx,running770/libvpx,cinema6/libvpx,n4t/libvpx,Suvarna1488/webm.libvpx,smarter/aom,Distrotech/libvpx,mbebenita/aom,WebRTC-Labs/libvpx,altogother/webm.libvpx,jacklicn/webm.libvpx,abwiz0086/webm.libvpx,ittiamvpx/libvpx-1,liqianggao/libvpx,hsueceumd/test_hui,lyx2014/libvpx_c,Maria1099/webm.libvpx,sanyaade-teachings/libvpx,VTCSecureLLC/libvpx,Suvarna1488/webm.libvpx,goodleixiao/vpx,thdav/aom,Distrotech/libvpx,jdm/libvpx,lyx2014/libvpx_c,Laknot/libvpx,sanyaade-teachings/libvpx,liqianggao/libvpx,Distrotech/libvpx,ittiamvpx/libvpx-1,mwgoldsmith/libvpx,Topopiccione/libvpx,reimaginemedia/webm.libvpx,matanbs/vp982,matanbs/vp982,lyx2014/libvpx_c,mbebenita/aom,luctrudeau/aom,thdav/aom,cinema6/libvpx,Distrotech/libvpx,zofuthan/libvpx,kim42083/webm.libvpx