Tab nav bar navigation to dissabled

[FallenRiteMonk]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Having a disabled mat-tab-link should prevent a user from navigating to the disabled page by clicking on the link.

What is the current behavior?

Having a mat-tab-nav-bar with a disabled link, one can still navigate to the disabled page.

What are the steps to reproduce?

https://stackblitz.com/edit/angular-material2-issue-lz8mcw

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