Hide toolchain static libraries in tests.

Hasn't caused any problems, but we do this in our other build systems,
so we should match that here.

Test: ndk/run_tests.py
Bug: None
Change-Id: I6343cd5177890c782e398cd093e7e26a0765e05a
(cherry picked from commit 800f5ed91cf73fcbc90fcb773550c719a95e57a7)
1 file changed