* Add new option to do a clean Ninja build.

* Enable Interpreter and unit-test.

* Enable json.

* Enable NOP backend.

* Enable tools.

* Enable CPU DEX ONLY on Linux.

* Quick hack to enable dex only on Mac.

* Enable onnx import.

* Cleanup gtest.

* Cleanup tbb_prebuilt.

* Fix typo.

* Move gtest include point.

* Fix gtest windows path.

* Remove temporary option.

* Keep GCPU upto date with INTERPRETER.

* Add missing file.

* Enable GCPU.

* Enable CPU codegen.

* Remove tabs.

* Revert "Merge branch 'silee2/gcpu' into silee2/ninja"

This reverts commit e513cd3fe3659a477af6e8fab6c1852a5b1493c3, reversing
changes made to 31dca3301cd89e15af23acd0d50aa06a1c5d6001.

* Enable PlaidML.
Co-authored-by: aslepko <44713115+aslepko@users.noreply.github.com>