Fix build on Windows

Author: floppyhammer

pathfinder/gpu/vk/window_builder.h

@@ -12,14 +12,14 @@
 namespace Pathfinder {
 
 /// List of required validation layers.
-const std::vector VALIDATION_LAYERS = {"VK_LAYER_KHRONOS_validation"};
+const std::vector<const char*> VALIDATION_LAYERS = {"VK_LAYER_KHRONOS_validation"};
 
 /// List of required device extensions.
-const std::vector DEVICE_EXTENSIONS = {
+const std::vector<const char*> DEVICE_EXTENSIONS = {
     VK_KHR_SWAPCHAIN_EXTENSION_NAME,
 };
 
-const std::vector INSTANCE_EXTENSIONS = {
+const std::vector<const char*> INSTANCE_EXTENSIONS = {
     "VK_KHR_surface",
 #ifdef __ANDROID__
     "VK_KHR_android_surface",