message: Fix test failing if compiler eliminates dead inputs
diff: @@ -35,7 +35,7 @@ void vertmain(in float3 pos : INPOS, in float4 col : INCOL, in float2 uv : UV,
  out float4 opos : SV_Position, out float4 outcol : COL)
  {
  opos = float4(pos.xyz*float3(1,-1,1), 1);
  - outcol = col;
  + outcol = col + 1.0e-10 * uv.xyxy;
  }
  )EOSHADER";
  