title: Vulkan and glfw - glfwVulkanSupported() always return false
body: <p>I'm trying to run a basic Vulkan test using GLFW3.2 :</p>
  
  <pre><code>#include &lt;vulkan/vulkan.h&gt;
  #include &lt;GLFW/glfw3.h&gt;
  
  #include &lt;iostream&gt;
  
  int main(int argc, char *argv[])
  {
      if (glfwVulkanSupported())
      {
          std::cout &lt;&lt; "vulkan supported !" &lt;&lt; std::endl;
  
      }
      else 
      {
          std::cout &lt;&lt; "vulkan NOT supported !" &lt;&lt; std::endl;
  
      }
      return 0;
  }
  </code></pre>
  
  <p>Which i build using the following cmake :</p>
  
  <pre><code>cmake_minimum_required(VERSION 3.5.1)
  project(vktest)
  
  set (CMAKE_CXX_STANDARD 11)
  set(CMAKE_CXX_COMPILER "/usr/bin/g++-4.9")
  
  set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
  set(CMAKE_INCLUDE_CURRENT_DIR ON)
  
  find_package(Vulkan REQUIRED)
  find_package(glfw3 3.2 REQUIRED)
  include_directories(${Vulkan_INCLUDE_DIRS})
  
  message("kek")
  message(${Vulkan_INCLUDE_DIRS})
  message(${Vulkan_LIBRARIES})
  message(${Vulkan_LIBRARY})
  
  add_executable(vktest vulkanTest.cpp)
  
  target_link_libraries(vktest ${Vulkan_LIBRARIES})
  target_link_libraries(vktest glfw)
  </code></pre>
  
  <p>Building this works just fine. </p>
  
  <p>But when i run the program i always get in the else statement.</p>
  
  <p>I installed nvidia last driver, lunarg's vulkan sdk with the following 
  environment variables :</p>
  
  <pre><code>export VULKAN_SDK=/home/mathias/vulkan/VulkanSDK/1.0.42.2/x86_64
  set PATH $VULKAN_SDK/bin $PATH
  set LD_LIBRARY_PATH $VULKAN_SDK/lib $LD_LIBRARY_PATH
  set VK_LAYER_PATH $VULKAN_SDK/etc/explicit_layer.d 
  </code></pre>
  
  <p>Besides i can run the cube example.</p>
  
  <p>Any idea of why it never returns true ?</p>