Fix 32-bit build for tpl model
Fix 32-bit build for tpl model

Clear system state to avoid encoding failure in 32-bit build.

BUG=webm:1547

Change-Id: Ia74c789d1993da09bc400baf24e971e19752e3c3

webmproject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,webmproject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx