Recompile STL sources when building tests

This CL works around b/240432457 by recompiling the sources of
PlatformComposeSceneTransitionLayout when compiling the associated tests
so that we can access internal members without polluting the public API.

Bug: 240432457
Test: atest PlatformComposeSceneTransitionLayoutTests
Flag: NA
Change-Id: I4ffceda155e836e360a2d8f562e2e3c43da8bbf0
6 files changed