zink/codegen: do not include compilation structs with extension structs

zink/codegen: do not include compilation structs with extension structs

(compilation structs refer to VkPhysicalDeviceVulkanXYFeatures/Properties, as
they consist of all features added by extensions promoted in VK X.Y)

The spec prohibits this, so instead we map the fields in the compilation
structs onto the fields in extension structs.

Some extensions' feature/properties structs are not promoted, and the spec
allows including both compilation structs and extension structs in such cases.

Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16265>