Stub Vulkan backend support

A lot of the architecture of the emulator here does not allow for vulkan
to initialize easily since it involves a bit of data to be exchanged
between SDL and Vulkan. This commit just adds the foundational linkage
and library code for vulkan support.

src/emulator.cpp

@@ -52,6 +52,16 @@ Emulator::Emulator()
 		}
 	}
 
+#ifdef PANDA3DS_ENABLE_VULKAN
+	if (config.rendererType == RendererType::Vulkan) {
+		window = SDL_CreateWindow("Alber", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, width, height, SDL_WINDOW_VULKAN);
+
+		if (window == nullptr) {
+			Helpers::panic("Window creation failed: %s", SDL_GetError());
+		}
+	}
+#endif
+
 	if (SDL_WasInit(SDL_INIT_GAMECONTROLLER)) {
 		gameController = SDL_GameControllerOpen(0);