Resolve ErrorIncompatibleDriver with Vulkan on MacOS.

Refs:
- https://chat.openai.com/share/7020ce72-65fc-45ec-b7be-9d9d798a5f3f
- SaschaWillems/Vulkan#954
- haasn/libplacebo#128
- KhronosGroup/Vulkan-Samples#476

ggml-vulkan.cpp

@@ -1109,8 +1109,10 @@ static void ggml_vk_instance_init() {
 #ifdef GGML_VULKAN_VALIDATE
         "VK_EXT_validation_features",
 #endif
+        "VK_KHR_portability_enumeration",
     };
-    vk::InstanceCreateInfo instance_create_info(vk::InstanceCreateFlags(), &app_info, layers, extensions);
+
+    vk::InstanceCreateInfo instance_create_info(vk::InstanceCreateFlags(vk::InstanceCreateFlagBits::eEnumeratePortabilityKHR), &app_info, layers, extensions);
 #ifdef GGML_VULKAN_VALIDATE
     const std::vector<vk::ValidationFeatureEnableEXT> features_enable = { vk::ValidationFeatureEnableEXT::eBestPractices };
     vk::ValidationFeaturesEXT validation_features = {