Roll libyuv to 994 for arm64 initial support using C versions of code.
BUG=chromium:354539
TESTED=GYP_DEFINES="OS=ios target_arch=armv7 target_subarch=64" GYP_CROSSCOMPILE=1 GYP_GENERATOR_FLAGS="output_dir=out_ios" ./build/gyp_chromium -f ninja --depth=. libyuv_test.gyp  && ninja -j7 -C out_ios/Debug-iphoneos
R=andrew@webrtc.org, thorcarpenter@google.com

Review URL: https://webrtc-codereview.appspot.com/10929005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5819 4adac7df-926f-26a2-2b94-8c16560cd09d
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