[MacPorts] #54520: Avidemux: Update to 2.6.20 and misc changes

[MacPorts]

#54520: Avidemux: Update to 2.6.20 and misc changes
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 Reporter:  bgrupe27  |      Owner:
     Type:  update    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  avidemux
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 Hi,

 avidemux is pretty outdated and I started to work on updating it to
 2.6.20.

 The portfile diff is attached. One error occurs during build regarding to
 x264:

 {{{CMake Error at
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_multimedia_avidemux/avidemux/work/destroot/opt/local/include/avidemux/2.6/cmake/admCheckX264.cmake:24
 (ELSE):
   A duplicate ELSE command was found inside an IF block.
 Call Stack (most recent call first):
   ADM_videoEncoder/x264/CMakeLists.txt:12 (checkX264)
 }}}

 A quick fix would be the attached diff, would that be acceptable?

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Ticket URL: <https://trac.macports.org/ticket/54520>
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