Function vkCreateSamplerYcbcrConversion 

pub unsafe extern "system" fn vkCreateSamplerYcbcrConversion(
    device: VkDevice,
    pCreateInfo: *const VkSamplerYcbcrConversionCreateInfo,
    pAllocator: *const VkAllocationCallbacks,
    pYcbcrConversion: *mut VkSamplerYcbcrConversion,
) -> VkResult

Available if built with exported-prototypes.