[Cin] Discovered problem with future ffmpeg 8.0

[Phyllis Smith]

After applying current ffmpeg.git as of May 25:
ae0f71a387f05be7ac90d545af4d3aeb8e1cca89  and applying Andrew's patches:
  0001-Add-check-for-nb_inputs-before-calling-avfilter_get_.patch
  0002-Same-possible-crash-fix-in-ffstreamaudio-for-dynamic.patch
  0003-Do-not-filter-out-dynamic_input-filters.patch
  0004-HACK-ffmpeg-8.0-build.patch
CinGG builds but none of the ffmpeg plugins work.  The Video plugins crash
(did not try them all, but a few like F_boxblur) when added to the timeline
and then click on "Show Controls.  The Audio plugins do not crash but you
get the warning tone only when you play them (again, I did not try them
all, but F_chorus was one of them).

I have not looked at the code yet, but most likely it is just an oversight
in trying to get it to compile.
Also, line 77 in 0004-HACK-ffmpeg-8.0-build.patch has "#esle" instead of
"else".
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