Fix the CullPrimitiveEXT VUID's #998

Job	Run time
Run consistency checks on the spec and XML sources	56s
Verify repository license compliance	38s
Build the core-only spec, to try and catch ifdef errors in extension markup	51s
Run Vulkan CTS framework tests to validate against XML changes	1m 36s
Build the vulkan specification and generate any associated files (such as vulkan.h)	7m 15s
Build a test spec and check against expectation, to make sure the spec toolchain works as expected	1m 16s
Generate the vulkan C++ header (vulkan.hpp)	1m 19s
Generate Rust bindings (Ash crate)	24s
Compile a simple test program that uses vulkan.h	7s
Build-test Rust bindings (Ash crate)	32s
Compile a simple test program that uses vulkan.hpp	20s
	15m 14s

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