[FFmpeg-trac] #7310(build system:new): configure broken with GNU sed version 4.1.5

[FFmpeg]

#7310: configure broken with GNU sed version 4.1.5
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             Reporter:  cehoyos      |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  important    |                Component:  build
              Version:  git-master   |  system
             Keywords:  regression   |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by michael.kostylev):

 The above quick test passed on FreeBSD 11.2, OpenBSD 6.2, Solaris 10,11,
 OpenIndiana 2017.10, AIX 7.1, numerous ancient Linuxes.
 And FATE passed on Sol 11.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7310#comment:8>
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