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

* commit '1a7eb59c2a7907ea4c4925c6d13d66e53fb60339':
  libvulkan: Discover layer libraries in entire search path

Change-Id: I714077f8e4174be74293032a64f31e60c2308d22