Remove custom Tensorflow Patch (execution_plan)

[feliwir]

The patch making execution_list can be removed in favor of the following vanilla API (inside tflitemodelstate.cpp):

...
  auto orig_plan = interpreter->primary_subgraph().execution_plan();
...

In terms of behaviour this is identical to the current code. Since this returns a non-const reference we can also the the execution_plan like that.

[reuben]

Can you make a PR?

[feliwir]

Can i submit a PR for a CMake based buildsystem first? I refuse to install/use Bazel, i build the native client locally with cmake anyways

[reuben]

No, seems like keeping the current code around is a better tradeoff than adding an entire new build system.

[feliwir]

Are there any other patches to tensorflow_lite that must be removed?

[feliwir]

I can try to apply this fix "blind", but there's little benefit if we can't switch to upstream tensorflow