Mask Vulkan layers in home directory or other non-/usr paths
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runtime: Never set XDG_DATA_DIRS to just our override directory
This will break the ability to find .desktop files, etc., in their default search paths. Default to /usr/local/share:/usr/share as per the specification.
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graphics: Add _srt_graphics_get_vulkan_search_paths to internal header
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runtime: Mask Vulkan layers in home directory or other non-/usr paths
This avoids the Steam fossilize and overlay layers being duplicated in the container's search path.
Resolves: T26160