[FFmpeg-trac] #4476(avcodec:new): Update libvpx to version 1.4.0

[FFmpeg]

#4476: Update libvpx to version 1.4.0
-------------------------------------+-------------------------------------
             Reporter:  VP8m8        |                     Type:
               Status:  new          |  enhancement
            Component:  avcodec      |                 Priority:  normal
             Keywords:  libvpx vp9   |                  Version:  git-
             Blocking:               |  master
Analyzed by developer:  0            |               Blocked By:
                                     |  Reproduced by developer:  0
-------------------------------------+-------------------------------------
 Currently libvpx 1.3.0 is implemented in ffmpeg. Version 1.4.0 of libvpx
 was released and should now be implemented into ffmpeg. The new version
 has significant improvements to VP9:
 * Fixes a VP9 bitstream issue in Profile 1. This only affects non-YUV
 4:2:0 files.
 * Significant algorithmic improvements to VP9 encoding, support for YUV
 4:2:2 and 4:4:4 colorspaces as well as high bit depth (10 and 12 bit).
 * More functions are now optimized for VP9 encoding and decoding.
 * VP9 encodes are faster with multithreaded encoding on by default.
 * VP9 decoder now has two multithreaded modes: tile based and frame based.
 The encoder now enables these by default to help ensure your encoded
 content will be able to take advantage of these modes.
 * 64bit support for ARM thanks to intrinsics instead of ARM assembly.

 The new version announcement along with the download link can be found
 here (bullets copied from here).
 https://groups.google.com/a/webmproject.org/forum/#!topic/codec-
 devel/2zYWenmdUM8

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Ticket URL: <https://trac.ffmpeg.org/ticket/4476>
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