message: fix for some platforms (Ubuntu 16.04) not defining glfw target when imported
diff: @@ -44,7 +44,11 @@ else()
  message(STATUS "Using GLFW found in the environment")
  endif()
  +#NOTE(jda) - on Ubuntu16.04, the 'glfw' target doesn't exist here "yet", but
  +# still works as a target for linking the viewer app (???)
  +if (TARGET glfw)
  get_property(glfw3_INCLUDE_DIRS TARGET glfw PROPERTY INTERFACE_INCLUDE_DIRECTORIES)
  +endif()
  set(GLFW_INCLUDE_DIRS ${glfw3_INCLUDE_DIRS}
  CACHE INTERNAL "Found GLFW includes")
  