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

* commit '1fa3681447cfecd5a555c977eec21e3bf814e9d6':
  libvulkan: Discover layer libraries in entire search path

Change-Id: I9dd0c252323de4073a7e989bfe2d4f8d5c0c06c1