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This change is mostly motivated by missing
VK_KHR_PORTABILITY_ENUMERATION_EXTENSION_NAME instance extension when enumerating the devices. Which causes issues with MoltenVK which does not advertise full Vulkan conformance.
To avoid duplicating code use pl_vk_inst_create() which correctly query availability and enables the mentioned extension.
While at it fix the VkInstance leaking in vk_validate_dev().