In Cube demo app, replace call to demo_update_and_draw()

with call to demo_draw() to support new version of cube.c.

Update to latest version of VulkanSamples.

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

@@ -42,7 +42,7 @@
 	self.view.contentScaleFactor = UIScreen.mainScreen.nativeScale;
 
 	demo_main(&demo, self.view);
-	demo_update_and_draw(&demo);
+	demo_draw(&demo);
 
 	uint32_t fps = 60;
 	_displayLink = [CADisplayLink displayLinkWithTarget: self selector: @selector(renderLoop)];
@@ -51,7 +51,7 @@
 }
 
 -(void) renderLoop {
-	demo_update_and_draw(&demo);
+	demo_draw(&demo);
 }
 
 @end

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

@@ -59,7 +59,7 @@ static CVReturn DisplayLinkCallback(CVDisplayLinkRef displayLink,
 									CVOptionFlags flagsIn,
 									CVOptionFlags* flagsOut,
 									void* target) {
-	demo_update_and_draw((struct demo*)target);
+	demo_draw((struct demo*)target);
 	return kCVReturnSuccess;
 }
 

ExternalRevisions/VulkanSamples_repo_revision

@@ -1 +1 @@
-d435e00dc9f614155621cdadd2f00fbd0585cda6
+8dc54f70b2f11858b422477e7a9eaa7fb455dee2