loader: Expand lib search locations
loader: Expand lib search locations

Expand library search locations based on recommendations by
Dustin.  We still attempt to use the old LoadLibrary first,
and then, only if that fails, do we attempt to use the new search.

Change-Id: I4cf1358f9eb7e45ac61f36435e926aa89c212f83

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools