Add missing custom attribute #988

Job	Run time
Verify repository license compliance	38s
Run Vulkan CTS framework tests to validate against XML changes	1m 42s
Build the core-only spec, to try and catch ifdef errors in extension markup	52s
Run consistency checks on the spec and XML sources	51s
Build the vulkan specification and generate any associated files (such as vulkan.h)	6m 19s
Build a test spec and check against expectation, to make sure the spec toolchain works as expected	1m 13s
Compile a simple test program that uses vulkan.h	8s
Generate Rust bindings (Ash crate)	1m 1s
Generate the vulkan C++ header (vulkan.hpp)	1m 10s
Build-test Rust bindings (Ash crate)	54s
Compile a simple test program that uses vulkan.hpp	20s
	15m 8s

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