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

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

Change-Id: I82e1c9f06305e22301ffe33ef77da463e9bafc2d