Specify `instruction_addr_adjustment: "none"` when using Android libunwindstack about sentry-native HOT 2 CLOSED

Yes, that would be exactly it.
I guess just doing it in our own SDK code so it is being set correctly in the inproc handler on Android is enough.
If someone is using their own unwinder and create their own stack traces, it is their responsibility to set the proper value, which is a oneliner.

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Is the idea here (for now) to add this only for libunwindstack as a special case, or should we expose this cleanly in the API too?

For the former, I would do something simple like the following here:

#ifdef SENTRY_WITH_UNWINDER_LIBUNWINDSTACK
    // libunwindstack already adjusts the PC according to `GetPcAdjustment()`
    // https://github.com/getsentry/libunwindstack-ndk/blob/1929f7b601797fc8b2cac092d563b31d01d46a76/Regs.cpp#L187
    // so there is no need to adjust the PC in the backend processing.
    sentry_value_set_by_key(stacktrace, "instruction_addr_adjustment",
        sentry_value_new_string("none"));
#endif

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