Fix build with --enable-internal-stats
Fix build with --enable-internal-stats

Change-Id: I9649647cc5755c8411ddd56f92e7f96d421c2663

luctrudeau/aom,smarter/aom,mbebenita/aom,mwgoldsmith/vpx,mwgoldsmith/libvpx,mwgoldsmith/libvpx,mwgoldsmith/vpx,webmproject/libvpx,luctrudeau/aom,webmproject/libvpx,mwgoldsmith/libvpx,ittiamvpx/libvpx-1,ittiamvpx/libvpx-1,mbebenita/aom,ittiamvpx/libvpx-1,smarter/aom,mwgoldsmith/vpx,ShiftMediaProject/libvpx,Topopiccione/libvpx,mbebenita/aom,Topopiccione/libvpx,mbebenita/aom,mbebenita/aom,luctrudeau/aom,mbebenita/aom,GrokImageCompression/aom,luctrudeau/aom,GrokImageCompression/aom,GrokImageCompression/aom,mwgoldsmith/vpx,mwgoldsmith/libvpx,webmproject/libvpx,webmproject/libvpx,mwgoldsmith/vpx,webmproject/libvpx,GrokImageCompression/aom,ShiftMediaProject/libvpx,smarter/aom,ShiftMediaProject/libvpx,Topopiccione/libvpx,mbebenita/aom,ShiftMediaProject/libvpx,luctrudeau/aom,ittiamvpx/libvpx-1,smarter/aom,ShiftMediaProject/libvpx,Topopiccione/libvpx,mwgoldsmith/libvpx,mbebenita/aom,mbebenita/aom,GrokImageCompression/aom,mwgoldsmith/vpx,ittiamvpx/libvpx-1,luctrudeau/aom,Topopiccione/libvpx,ittiamvpx/libvpx-1,smarter/aom,Topopiccione/libvpx,mwgoldsmith/libvpx,GrokImageCompression/aom,webmproject/libvpx,smarter/aom