rewrite the ffi tutorial with snappy as an example #5849
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The code samples are xfail'ed because the buildbot won't have
libsnappy.so
and I don't want to add boilerplate to all the snippets (but they're directly from my snappy bindings so I'll just send a pull request whenever they break). It works really well as an example because it's tiny library and lets the caller manage all the buffers.I think everything stated in the
Interoperability with foreign code
section is accurate but it deserves a thorough double-check :).