Don't install unused brew packages

.github/workflows/mac.yml

@@ -66,8 +66,7 @@ jobs:
       - name: First set up.
         run: |
           sudo chown -R `whoami`:admin /usr/local/share
-          brew install automake fdk-aac lame libass libtool libvorbis libvpx \
-          ninja opus sdl shtool texi2html theora x264 xvid yasm pkg-config
+          brew install automake
 
           # Disable spotlight.
           sudo mdutil -a -i off