Problem one: it requires its own binary, which we haven't built. There
are instructions in sdl/src/hidapi/README.txt, if we ever want to try.
Problem two: the Android app segfaults when `hid_init()` calls
`g_JVM->AttachCurrentThread()`. This might be a bug in NDK 21's jni.h,
but that seems unlikely. Perhaps a version mismatch?
In any case, we aren't using the code at the moment, so the easy answer
is to leave it out.
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