ffmpeg: depend on librist

Formula/ffmpeg.rb

@@ -6,7 +6,7 @@ class Ffmpeg < Formula
   # None of these parts are used by default, you have to explicitly pass `--enable-gpl`
   # to configure to activate them. In this case, FFmpeg's license changes to GPL v2+.
   license "GPL-2.0-or-later"
-  revision 2
+  revision 3
   head "https://github.com/FFmpeg/FFmpeg.git"
 
   livecheck do
@@ -34,6 +34,7 @@ class Ffmpeg < Formula
   depends_on "lame"
   depends_on "libass"
   depends_on "libbluray"
+  depends_on "librist"
   depends_on "libsoxr"
   depends_on "libvidstab"
   depends_on "libvorbis"
@@ -83,6 +84,7 @@ def install
       --enable-libmp3lame
       --enable-libopus
       --enable-librav1e
+      --enable-librist
       --enable-librubberband
       --enable-libsnappy
       --enable-libsrt