[FFmpeg-trac] #2780(build system:new): configure does not test for SA_RESTART

[FFmpeg]

#2780: configure does not test for SA_RESTART
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  minor      |              Component:  build
                Version:  git-       |  system
  master                             |               Keywords:
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 Some versions of qnx apparently ship without SA_RESTART defined (it was
 defined before, but did not work):
 http://thread.gmane.org/gmane.comp.video.ffmpeg.libav.user/11372/focus=11388
 http://www.qnx.de/support/knowledgebase.html?id=50130000000SmiD

 configure should test for SA_RESTART and only enable ffserver compilation
 if it exists.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2780>
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