vulkancts: work around loader bug
When given multiple options, the vulkan loader will attempt to load an incompatible driver for the following cts test:
dEQP-VK.api.device_init.create_instance_device_intentional_alloc_fail.basic
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When given multiple options, the vulkan loader will attempt to load an incompatible driver for the following cts test:
dEQP-VK.api.device_init.create_instance_device_intentional_alloc_fail.basic