Specify that the stored size of headerVersion in VkPipelineCacheHeaderVersionOne is 4 bytes #995

Job	Run time
Run consistency checks on the spec and XML sources	49s
Run Vulkan CTS framework tests to validate against XML changes	1m 48s
Verify repository license compliance	37s
Build the core-only spec, to try and catch ifdef errors in extension markup	51s
Build the vulkan specification and generate any associated files (such as vulkan.h)	6m 56s
Build a test spec and check against expectation, to make sure the spec toolchain works as expected	1m 17s
Generate Rust bindings (Ash crate)	1m 11s
Generate the vulkan C++ header (vulkan.hpp)	1m 0s
Compile a simple test program that uses vulkan.h	13s
Build-test Rust bindings (Ash crate)	38s
Compile a simple test program that uses vulkan.hpp	29s
	15m 49s

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