vulkaninfo: check that extensions aren't disabled
vulkaninfo: check that extensions aren't disabled

Previous versions of vulkainfo's autogen code didn't check if enums and
bitmasks from extensions were disabled, possibly letting them leak into
the generated code. This commit checks and skips any fields which aren't
supported.

File changed:
	scripts/vulkaninfo_generator.py

Change-Id: I0e6fd9872d9377a17797cfcf6c2fbcee649e3657

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools