Add API header tests

Test to verify that all functions can be referred to, for each version.
This can be useful to cross-verify the generator and to validate the
white list.

b/19425238

Change-Id: I002b9e0f1b9c53b966cb34c1b8be05a4b7fdff24
(cherry picked from commit 8bfe4144673101b8a0218d98888a7443cc8aa4ca)
39 files changed