Cleanup

Cleanup of 8bdb105897.

Add build macro to configuration header and documentation.  Add
corresponding CMake option.  Add change log entry and credit.  Add
loader static library to link dependencies and add detection to
FindVulkan.cmake.

src/vulkan.c

@@ -80,7 +80,6 @@ GLFWbool _glfwInitVulkan(void)
         _glfwTerminateVulkan();
         return GLFW_FALSE;
     }
-
 #endif // _GLFW_VULKAN_STATIC
 
     err = vkEnumerateInstanceExtensionProperties(NULL, &count, NULL);