python3Packages.torchaudio: remove unused ffmpeg dependency

pkgs/development/python-modules/torchaudio/default.nix

@@ -10,7 +10,6 @@
   ninja,
 
   # buildInputs
-  ffmpeg_6-full,
   pybind11,
   sox,
   torch,
@@ -99,15 +98,6 @@ buildPythonPackage.override { inherit stdenv; } (finalAttrs: {
 
   env = {
     TORCH_CUDA_ARCH_LIST = "${lib.concatStringsSep ";" torch.cudaCapabilities}";
-    # https://github.com/pytorch/audio/blob/v2.1.0/docs/source/build.linux.rst#optional-build-torchaudio-with-a-custom-built-ffmpeg
-    FFMPEG_ROOT = symlinkJoin {
-      name = "ffmpeg";
-      paths = [
-        ffmpeg_6-full.bin
-        ffmpeg_6-full.dev
-        ffmpeg_6-full.lib
-      ];
-    };
     BUILD_SOX = 0;
     BUILD_KALDI = 0;
     BUILD_RNNT = 0;
@@ -130,7 +120,6 @@ buildPythonPackage.override { inherit stdenv; } (finalAttrs: {
   );
 
   buildInputs = [
-    ffmpeg_6-full
     pybind11
     sox
     torch.cxxdev