bug: multiple import statements for tslib

[alan-agius4]

Type of Issue

[x] Bug Report
[ ] Feature Request

Description

In some cases when downleveling you'll end up with 2 import statements for tslibs example

import * as tslib_1 from "tslib";
import { __decorate, __metadata } from 'tslib';

This not ideal as the first one requires to import the whole library.

How To Reproduce

Just run build

Expected Behaviour

Only a single import is present

Version Information

ng-packagr: 2.0.0-rc.13
@angular/*: x.y.z
typescript: x.y.z
rxjs: x.y.z
node: x.y.z
npm/yarn: x.y.z

please include any version information that might be relevant, e.g. other third-party libraries

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