This annotation can be used for data types that can't be repacked
automatically even with custom repack annotations. With ptr_passthrough,
the types are wrapped in guest_layout and passed to the host like that.
A couple of games were hitting these. Not sure how they were missed in
PR #3159 but adds the missing one.
Small rearrangement to make this easier as well. Hopefully thunk stuff
lands sooner rather than later to automate this for Vulkan.
Maybe `-isystem` instead of `-I` needs to be used unlike what #2076,
might depend on what is installed on the host system.
Tony Wasserka