feat(@schematics/angular): add support for watch when building a library

`ng-packagr` version `4.0.0-rc.3`, lands the incremental builds feature.

More info:  https://github.com/dherges/ng-packagr/blob/master/CHANGELOG.md#400-rc2-2018-06-23

`enableResourceInlining` needs to be enabled for libraries that contain components

Closes: #11100

Author: alan-agius4

packages/schematics/angular/library/files/__projectRoot__/ng-package.json

@@ -1,7 +1,6 @@
 {
   "$schema": "<%= relativePathToWorkspaceRoot %>/node_modules/ng-packagr/ng-package.schema.json",
   "dest": "<%= relativePathToWorkspaceRoot %>/<%= distRoot %>",
-  "deleteDestPath": false,
   "lib": {
     "entryFile": "src/<%= entryFile %>.ts"
   }

packages/schematics/angular/library/files/__projectRoot__/ng-package.prod.json

@@ -35,7 +35,6 @@ import { latestVersions } from '../utility/latest-versions';
 import { validateProjectName } from '../utility/validation';
 import { Schema as LibraryOptions } from './schema';
 
-
 interface UpdateJsonFn<T> {
   (obj: T): T | void;
 }
@@ -145,11 +144,6 @@ function addAppToWorkspaceFile(options: LibraryOptions, workspace: WorkspaceSche
           tsConfig: `${projectRoot}/tsconfig.lib.json`,
           project: `${projectRoot}/ng-package.json`,
         },
-        configurations: {
-          production: {
-            project: `${projectRoot}/ng-package.prod.json`,
-          },
-        },
       },
       test: {
         builder: '@angular-devkit/build-angular:karma',

packages/schematics/angular/library/index.ts

@@ -74,7 +74,6 @@ describe('Library Schematic', () => {
     const fileContent = getJsonFileContent(tree, '/projects/foo/ng-package.json');
     expect(fileContent.lib).toBeDefined();
     expect(fileContent.lib.entryFile).toEqual('src/my_index.ts');
-    expect(fileContent.deleteDestPath).toEqual(false);
     expect(fileContent.dest).toEqual('../../dist/foo');
   });