Add minimal ffmpeg build to linux wheel job envs #2137
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This change adds a minimal ffmpeg installation step to the build wheel job so that later, we can use the resulting ffmpeg libraries for building torchaudio's ffmpeg-features.
The linux wheel build jobs run in CentOS 8 based environment, which does not provide an easy way to install ffmpeg without conda.
After #2124 is merged, then we can enable the ffmpeg-feature build in Linux wheel.