Import libvpx source code
Created attachment 350760 [details] patch
Reverted r236498 for reason: This wasn't intentionally committed Committed r236502: <https://trac.webkit.org/changeset/236502>
Fixed in https://trac.webkit.org/changeset/236479 although the cq was not ended. The cq seems to have relanded in https://trac.webkit.org/changeset/236498 the part of the patch that was reverted as breaking internal builds in https://trac.webkit.org/changeset/236488 and https://trac.webkit.org/changeset/236493
<rdar://problem/44797345>