[MacPorts] #55894: gegl: fails to build against ffmpeg-devel

[MacPorts]

#55894: gegl: fails to build against ffmpeg-devel
--------------------+---------------------
 Reporter:  Ionic   |      Owner:  dbevans
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.4.99
 Keywords:          |       Port:  gegl
--------------------+---------------------
 {{{
 :info:build ff-load.c:312:36: error: use of undeclared identifier
 'CODEC_CAP_TRUNCATED'
 :info:build       if (p->codec->capabilities & CODEC_CAP_TRUNCATED)
 :info:build                                    ^
 :info:build ff-load.c:313:26: error: use of undeclared identifier
 'CODEC_FLAG_TRUNCATED'
 :info:build         p->enc->flags |= CODEC_FLAG_TRUNCATED;
 :info:build                          ^
 :info:build 9 warnings and 2 errors generated.
 }}}

 Not sure if these can be easily patched out and whether that's the only
 part that the build will stumble upon.

 `gegl` 0.2 is dead, only used by the stable `gimp2` port; users of the
 `ffmpeg` port will only hit this problem as soon as `ffmpeg` releases a
 new version (given that the last one was released half a year ago, chances
 aren't too bad that it will happen some time soonish).

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Ticket URL: <https://trac.macports.org/ticket/55894>
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