Reserve extension 603 #889

Job	Run time
Verify repository license compliance	37s
Run Vulkan CTS framework tests to validate against XML changes	1m 41s
Build the core-only spec, to try and catch ifdef errors in extension markup	45s
Build the vulkan specification and generate any associated files (such as vulkan.h)	5m 59s
Build a test spec and check against expectation, to make sure the spec toolchain works as expected	1m 10s
Run various checker scripts on the spec and XML sources	46s
Compile a simple test program that uses vulkan.h	11s
Generate Rust bindings (Ash crate)	27s
Generate the vulkan C++ header (vulkan.hpp)	1m 1s
Build-test Rust bindings (Ash crate)	4s
Compile a simple test program that uses vulkan.hpp	33s
	13m 14s

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