This resolves compilation errors relating to duplicate case values for
alias structures when building against spec version 1.1.106. An example
of one of these errors has been included below:
	vulkan_thunks.c: In function ‘convert_VkDeviceCreateInfo_struct_chain’:
	vulkan_thunks.c:1997:9: error: duplicate case value
	         case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_VARIABLE_POINTERS_FEATURES:
	         ^~~~
	vulkan_thunks.c:1377:9: note: previously used here
	         case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_VARIABLE_POINTERS_FEATURES:
         ^~~~
Signed-off-by: Liam Middlebrook <lmiddlebrook@nvidia.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>