FreeBSD/ports 9ff8c27 (r493097)multimedia/ffmpeg Makefile

multimedia/ffmpeg: unbreak SVTAV1=off on amd64 after r493026

===>  Configuring for ffmpeg-4.1.1,1
Unknown option "--disable-libsvtav1".
See ./configure --help for available options.
===>  Script "configure" failed unexpectedly.

Reported by:    leres
Pointy hat to:  jbeich
DeltaFile
+1-1multimedia/ffmpeg/Makefile
+1-11 files

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