try to fix build

scripts/ffmpeg-dl/dl.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 ffmpeg_version=4.1.3
 
-ffmpeg_linux_x64=https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-64bit-static.tar.xz
+ffmpeg_linux_x64=https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-amd64-static.tar.xz
 ffmpeg_darwin_x64=https://evermeet.cx/ffmpeg/ffmpeg-"${ffmpeg_version}".7z
 ffmpeg_win32_ia32=https://ffmpeg.zeranoe.com/builds/win32/static/ffmpeg-"${ffmpeg_version}"-win32-static.zip
 ffmpeg_win32_x64=https://ffmpeg.zeranoe.com/builds/win64/static/ffmpeg-"${ffmpeg_version}"-win64-static.zip

scripts/ffmpeg-dl/extract.sh

@@ -20,8 +20,8 @@ mkdir -p binaries/win32_ia32 &&
 mkdir -p binaries/win32_x64 &&
 mkdir -p binaries/darwin_x64 &&
 ls -R extracted &&
-mv extracted/linux_x64/ffmpeg-"${ffmpeg_version}"-64bit-static/ffmpeg binaries/linux_x64 &&
-mv extracted/linux_x64/ffmpeg-"${ffmpeg_version}"-64bit-static/ffprobe binaries/linux_x64 &&
+mv extracted/linux_x64/ffmpeg-"${ffmpeg_version}"-amd64-static/ffmpeg binaries/linux_x64 &&
+mv extracted/linux_x64/ffmpeg-"${ffmpeg_version}"-amd64-static/ffprobe binaries/linux_x64 &&
 mv extracted/win32_ia32/ffmpeg-"${ffmpeg_version}"-win32-static/bin/ffmpeg.exe binaries/win32_ia32 &&
 mv extracted/win32_ia32/ffmpeg-"${ffmpeg_version}"-win32-static/bin/ffprobe.exe binaries/win32_ia32 &&
 mv extracted/win32_x64/ffmpeg-"${ffmpeg_version}"-win64-static/bin/ffmpeg.exe binaries/win32_x64 &&