[FFmpeg-trac] #7861(swscale:new): altivec compilation broken starting with gcc 8.3

[FFmpeg]

#7861: altivec compilation broken starting with gcc 8.3
-------------------------------------+-------------------------------------
             Reporter:  q66          |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  swscale
              Version:  git-master   |               Resolution:
             Keywords:  altivec,     |               Blocked By:
  ppc64, power                       |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by q66):

 I was also able to confirm that the only affected files are
 `swscale_altivec.c` and `swscale_vsx.c`; replacing the instances of
 `vector (u)int(8|16|32)_t` with `vec_(u|s)(8|16|32)` from
 `libavutil/util_altivec.h` fixed the problem.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7861#comment:2>
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