fix(package): fixes #208 by compiling without Ivy

[bhuber2010]

** PR Type What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

** What is the current behavior? Library can not be used in pre-Ivy projects

Issue Number: #208

** What is the new behavior? Library works in pre-Ivy projects

** Does this PR introduce a breaking change?

[ ] Yes
[x] No

** Other information It's currently not recommended to build libraries with Ivy due to potentially losing support for ViewEngine compiled Angular projects.

[ghost]

Warnings are found on analyzing the commit fee1501.

2 warnings:

• ⚠️ Goodcheck
• ⚠️ TSLint

We recommend to address them as possible, for example, update outdated dependencies, fix the tool's configuration, configure sider.yml, turn off unused tools, and so on.

If you are struggling with these errors or warnings, feel free to ask us via chat. 💬

[codecov[bot]]

Codecov Report

Merging #209 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #209   +/-   ##
=======================================
  Coverage   98.75%   98.75%           
=======================================
  Files           7        7           
  Lines         161      161           
  Branches       47       47           
=======================================
  Hits          159      159           
  Misses          2        2           

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[fulls1z3]

@bhuber2010 need help with these PR's, especially with ng-packagr is failing. once done aim is first to ng 10 and then eventually to ng11 and ng12 (supporting all intermediate versions)

• https://github.com/fulls1z3/ngx-meta/pull/216
• https://github.com/fulls1z3/ngx-config/pull/169
• https://github.com/fulls1z3/ngx-cache/pull/141
• https://github.com/fulls1z3/ngx-auth/pull/135

and finally we're showcasing it on https://github.com/fulls1z3/universal/pull/755