Update V-LVL revision

- pick up 1.1.73 headers
- cope with interface change in cube demo

Demos/LunarG-VulkanSamples/Demos/macOS/DemoViewController.m

@@ -41,8 +41,8 @@
 	[super viewDidLoad];
 
 	self.view.wantsLayer = YES;		// Back the view with a layer created by the makeBackingLayer method.
-
-	demo_main(&demo, self.view);
+	const char* arg = "cube";
+	demo_main(&demo, self.view, 1, &arg);
 
 	CVDisplayLinkCreateWithActiveCGDisplays(&_displayLink);
 	CVDisplayLinkSetOutputCallback(_displayLink, &DisplayLinkCallback, &demo);

ExternalRevisions/Vulkan-LoaderAndValidationLayers_repo_revision

@@ -1 +1 @@
-359f2c1b6ca510a01f4c56f310ce0913ad345c3c
+5f35d6957bab18a0960cd3bdc05c8a89e5144f69