health vts: implement GTEST_SKIP if not defined.

gtest in Android P tree does not have GTEST_SKIP. Implement
a naive version of it.

Bug: 118852225
Test: manually undefine GTEST_SKIP, test with and without --force
Change-Id: I8df1154d8a94a67ae28e8024de6022fcfe76384d
Merged-In: I8df1154d8a94a67ae28e8024de6022fcfe76384d
(cherry picked from commit 03b2a3477b9c39403a8cc641e0d7ef2d092eff66)
1 file changed