tests/examples.sh: skip env. check for filtered tests

Change-Id: Ide670b00ae3ecd9e18f394905341bf793349f247
make vp9 encoder static initializers thread safe

Change-Id: If2d0888d13ebe52bc7c3b16f16319408a86ab6de
Merge "tests/examples.sh: skip env. check for filtered tests"
Merge "make vp9 encoder static initializers thread safe"