Reserve extension 603 (#2416) #890

Job	Run time
Run Vulkan CTS framework tests to validate against XML changes	1m 52s
Verify repository license compliance	33s
Build the core-only spec, to try and catch ifdef errors in extension markup	46s
Build the vulkan specification and generate any associated files (such as vulkan.h)	6m 12s
Build a test spec and check against expectation, to make sure the spec toolchain works as expected	1m 18s
Run various checker scripts on the spec and XML sources	52s
Compile a simple test program that uses vulkan.h	6s
Generate Rust bindings (Ash crate)	47s
Generate the vulkan C++ header (vulkan.hpp)	1m 6s
Build-test Rust bindings (Ash crate)	7s
Compile a simple test program that uses vulkan.hpp	32s
	14m 11s

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