kvm tool, sdl: Set window caption

Fix empty window caption for the tool. We should also display the guest name
but unfortunately the SDL code doesn't know about "struct kvm" so that requires
code reorganization.

Signed-off-by: Pekka Enberg <penberg@kernel.org>

ui/sdl.c

@@ -95,6 +95,8 @@ static void *sdl__thread(void *p)
 
 	flags = SDL_HWSURFACE | SDL_ASYNCBLIT | SDL_HWACCEL | SDL_DOUBLEBUF;
 
+	SDL_WM_SetCaption("KVM tool", "KVM tool");
+
 	screen = SDL_SetVideoMode(fb->width, fb->height, fb->depth, flags);
 	if (!screen)
 		die("Unable to set SDL video mode");