test_intra_pred_speed: reuse test_libvpx's main()
test_intra_pred_speed: reuse test_libvpx's main()

this allows test_libvpx's simd caps check to be used; it also fixes a
link error on OS X with -fcommon.

Change-Id: I1a62a3e74ba06b8f3b37a22fcfdebf90c04ab289

running770/libvpx,jmvalin/aom,mbebenita/aom,Topopiccione/libvpx,openpeer/libvpx_new,thdav/aom,mbebenita/aom,shyamalschandra/libvpx,smarter/aom,ittiamvpx/libvpx-1,shyamalschandra/libvpx,stewnorriss/libvpx,smarter/aom,goodleixiao/vpx,stewnorriss/libvpx,GrokImageCompression/aom,zofuthan/libvpx,VTCSecureLLC/libvpx,liqianggao/libvpx,mwgoldsmith/vpx,webmproject/libvpx,mbebenita/aom,openpeer/libvpx_new,webmproject/libvpx,mbebenita/aom,goodleixiao/vpx,luctrudeau/aom,stewnorriss/libvpx,jmvalin/aom,ittiamvpx/libvpx-1,goodleixiao/vpx,shacklettbp/aom,felipebetancur/libvpx,mwgoldsmith/vpx,shacklettbp/aom,mwgoldsmith/libvpx,mbebenita/aom,VTCSecureLLC/libvpx,shacklettbp/aom,running770/libvpx,smarter/aom,goodleixiao/vpx,shacklettbp/aom,mwgoldsmith/libvpx,stewnorriss/libvpx,zofuthan/libvpx,ShiftMediaProject/libvpx,openpeer/libvpx_new,Topopiccione/libvpx,felipebetancur/libvpx,ittiamvpx/libvpx-1,mbebenita/aom,jmvalin/aom,shyamalschandra/libvpx,mwgoldsmith/libvpx,liqianggao/libvpx,shyamalschandra/libvpx,felipebetancur/libvpx,liqianggao/libvpx,GrokImageCompression/aom,smarter/aom,webmproject/libvpx,smarter/aom,mbebenita/aom,felipebetancur/libvpx,liqianggao/libvpx,luctrudeau/aom,shacklettbp/aom,Topopiccione/libvpx,mbebenita/aom,luctrudeau/aom,GrokImageCompression/aom,GrokImageCompression/aom,webmproject/libvpx,openpeer/libvpx_new,ShiftMediaProject/libvpx,thdav/aom,thdav/aom,shacklettbp/aom,webmproject/libvpx,webmproject/libvpx,ittiamvpx/libvpx-1,ShiftMediaProject/libvpx,shyamalschandra/libvpx,mbebenita/aom,felipebetancur/libvpx,smarter/aom,openpeer/libvpx_new,thdav/aom,mwgoldsmith/libvpx,ittiamvpx/libvpx-1,openpeer/libvpx_new,jmvalin/aom,felipebetancur/libvpx,VTCSecureLLC/libvpx,jmvalin/aom,Topopiccione/libvpx,mwgoldsmith/vpx,zofuthan/libvpx,running770/libvpx,mwgoldsmith/libvpx,VTCSecureLLC/libvpx,ittiamvpx/libvpx-1,running770/libvpx,goodleixiao/vpx,zofuthan/libvpx,thdav/aom,shyamalschandra/libvpx,zofuthan/libvpx,zofuthan/libvpx,liqianggao/libvpx,VTCSecureLLC/libvpx,running770/libvpx,VTCSecureLLC/libvpx,ShiftMediaProject/libvpx,stewnorriss/libvpx,luctrudeau/aom,Topopiccione/libvpx,running770/libvpx,ShiftMediaProject/libvpx,goodleixiao/vpx,luctrudeau/aom,mwgoldsmith/vpx,GrokImageCompression/aom,mwgoldsmith/libvpx,thdav/aom,liqianggao/libvpx,luctrudeau/aom,stewnorriss/libvpx,mwgoldsmith/vpx,mwgoldsmith/vpx,GrokImageCompression/aom,Topopiccione/libvpx,jmvalin/aom