build fails if cdk components have scss

[mmalerba]

Issue can be repro'd by adding scss to an existing cdk component, e.g.: https://github.com/angular/material2/compare/master...mmalerba:cdk-scss-issue-repro?expand=1

I get the following error when running gulp serve:devapp:

: Couldn't resolve resource step.css relative to .../material2/src/cdk/stepper/stepper.ts


Failed to compile  using .../material2/src/cdk/tsconfig-tests.json

Failing task appears to be: cdk:build:esm:tests

[josephperrott]

fixed by #9470

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