Nx: source-map-support not bundled into output file

[IonFoXx]

Expected Behavior

@nrwl/builders:node-build with option externalDependencies: none bundles all dependencies into one single file.

Current Behavior

The generated output file has everything bundled within except source-map-support. This seems to be introduced through this change:
https://github.com/nrwl/nx/pull/1204

Failure Information (for bugs)

Steps to Reproduce

1. Create a new backend app
2. Change the externalDependencies to none under the newly generated app
3. run ng build <your-app-name-goes-here> --sourceMap=true --statsJson
4. Open the generated file
5. It contains at the first line require("source-map-support").install();

[FrozenPandaz]

Seems to be a breaking change.

@BuckyMaler We should switch to the CLI form.

[BuckyMaler]

I'll have a PR in soon.

[BuckyMaler]

@FrozenPandaz should I target master or 7.8.x in the PR?