libyuv r534 for tools folder valgrind and endian fix for big endian platforms like s390x. BUG=none TEST=try bots Review URL: https://webrtc-codereview.appspot.com/1031005
libyuv r534 for tools folder valgrind and endian fix for big endian platforms like s390x.
BUG=none
TEST=try bots
Review URL: https://webrtc-codereview.appspot.com/1031005

git-svn-id: 917f5d3ca488f358c4d40eaec14422cf392ccec9@3359 4adac7df-926f-26a2-2b94-8c16560cd09d

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