altref test: comment out 'pass'
altref test: comment out 'pass'

All the other test which do not use 'pass' (which appears to be almost
all of them) do this.

Cleans -Wextra/-Wunused-parameter:
unused parameter ‘pass’

Change-Id: I1ff3acf3f3d1e831f94dcb00ea36337afe0aefe0

mwgoldsmith/vpx,Topopiccione/libvpx,mwgoldsmith/vpx,mwgoldsmith/libvpx,mwgoldsmith/libvpx,mwgoldsmith/vpx,webmproject/libvpx,mwgoldsmith/libvpx,mwgoldsmith/vpx,mwgoldsmith/vpx,webmproject/libvpx,ShiftMediaProject/libvpx,mwgoldsmith/vpx,ShiftMediaProject/libvpx,Topopiccione/libvpx,mwgoldsmith/libvpx,Topopiccione/libvpx,webmproject/libvpx,Topopiccione/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,mwgoldsmith/libvpx,ShiftMediaProject/libvpx,Topopiccione/libvpx,Topopiccione/libvpx,webmproject/libvpx,mwgoldsmith/libvpx