libvpx

Merge changes I4c74dcab,Ifbfc1422,I2450b485,Ibdb07f6d,I3737772f,Ic3be55ed

* changes:
  vp9_pick_inter_mode: normalize some types
  vp9_pick_inter_mode: cosmetics: localize var. defs
  vp9_pick_inter_mode: cosmetics: add const
  vp9_pick_inter_mode: cosmetics: fix indent
  vp9_pickmode: move PRED_BUFFER definition to .c
  vp9_pickmode: make vp9_pick_inter_mode() void