customLaunchSetupCommands does not work with ARM targets due to arch

[robotdad]

Bug type: Debugger

Describe the bug

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• Other extensions you installed (and if the issue persists after disabling them):
• A clear and concise description of what the bug is.
  On Windows trying to use customLaunchSetupCommands to configure a target launch on an embedded arm device I am getting the error message "Unable to start debugging. Specified argument was out of the range of valid values. PArameter name: arch".

This needs a cross compile project to repro and some setup for the embedded debugger. I have some projects that can be shared for the repro.

[fbs2016]

Try to set "targetArchitecture": "arm64" in launch.json.