use system libffi (fixes arm64) #26
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Without this, it fails to build a native ffi gem and falls back on a bundled libffi which is too old to support aarch64.
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This is not a complete fix for arm, but it does get past the immediate problem of the ffi gem failing to install, as detailed in #24.
I also changed it to only fetch repo information (apt-get update) once at the beginning, and only clean once at the end. This saves dozens of megabytes and a few seconds to a few minutes of build time, depending on your connection speed.