[FFmpeg-trac] #10695(ffmpeg:new): error: use of undeclared identifier 'kVTCompressionPropertyKey_EncoderID' when targeting macOS < 10.13

[FFmpeg]

#10695: error: use of undeclared identifier 'kVTCompressionPropertyKey_EncoderID'
when targeting macOS < 10.13
-------------------------------------+-------------------------------------
             Reporter:               |                     Type:  defect
  aeiouaeiouaeiouaeiouaeiouaeiou     |
               Status:  new          |                 Priority:  important
            Component:  ffmpeg       |                  Version:  git-
             Keywords:  macos        |  master
  ffmpeg                             |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 First report: https://trac.macports.org/ticket/68720
 Similar issue: https://trac.ffmpeg.org/ticket/10690

 This regression was introduced in these two commits:
 https://github.com/FFmpeg/FFmpeg/commit/5c635b7d8c7c4a7fe0c93b5b3cefff3c72bff237
 https://github.com/FFmpeg/FFmpeg/commit/213cba9696c1525d5022d8c3597bddb6fab15379

 Both contain methods that introduced in High Sierra and are not guarded
 correctly, regardless of the use of macros from {{{Availability.h}}}.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10695>
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