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Switch types to C99 int8_t etc
Types are defined in basic_types.h
Also optimizes I420ToAR30 26% faster

92e22cf Lint cleanup after C99 change CL
f1c5345 Define basic_types backward compatible layer
7e38988 Switch to C99 types
13771ff basic_types.h - remove unused macros
a11ffa1 NV12 format documentation added.
8af6ea4 I420ToAR30 in 1 step SSSE3 assembly

Bug: 797347, libyuv:774, libyuv:751
Test: try bots passed for local libyuv build

Change-Id: If1060f71882886c237a46e1bb7791e3f5f419073
Reviewed-on: https://chromium-review.googlesource.com/881922Reviewed-by: Miguel Casas <mcasas@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531693}