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Enable use_altref_onepass for speed 4 real-time mode.

Used for VBR mode with lag-in-frames > 0.
On ytlive set at speed 4: ~3% average gain.

Change-Id: I45dad1700bf8be9d8f177815dc062774f6f2f0de

--- a/vp9/encoder/vp9_speed_features.c

+++ b/vp9/encoder/vp9_speed_features.c

@@ -443,6 +443,8 @@

   if (speed >= 4) {

     int i;

+    if (cpi->oxcf.rc_mode == VPX_VBR && cpi->oxcf.lag_in_frames > 0)

+      sf->use_altref_onepass = 1;

     sf->last_partitioning_redo_frequency = 4;

     sf->adaptive_rd_thresh = 5;

     sf->use_fast_coef_costing = 0;

@@ -468,6 +470,7 @@

   }

   if (speed >= 5) {

+    sf->use_altref_onepass = 0;

     sf->use_quant_fp = !is_keyframe;

     sf->auto_min_max_partition_size =

         is_keyframe ? RELAXED_NEIGHBORING_MIN_MAX : STRICT_NEIGHBORING_MIN_MAX;