libvulkan: Discover layer libraries in entire search path am: 1a7eb59c2a am: 1fa3681447
am: fb1816c499

* commit 'fb1816c499b1218fc4057f87562f15fe821fea2a':
  libvulkan: Discover layer libraries in entire search path

Change-Id: Ia7935d616d10e3fe3c025072a9ad7e69bcf4b632