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Some env var combination could result in duplicated ICDs in the container

Steps to reproduce

  • Ensure to have some valid vulkan json layers in /usr/share/vulkan/icd.d, like /usr/share/vulkan/icd.d/radeon_icd.x86_64.json
  • Launch Steam as XDG_CONFIG_DIRS=/usr/share XDG_DATA_DIRS=/usr/share steam
  • Check the Steam's system info

Expected behaviour

Under Vulkan->icds we expect to have /usr/share/vulkan/icd.d/radeon_icd.x86_64.json only listed once.

Actual behaviour

/usr/share/vulkan/icd.d/radeon_icd.x86_64.json is listed twice.

This happens because in get_vulkan_search_paths() we search in XDG_CONFIG_DIRS, XDG_DATA_DIRS etc. but we don't filter out duplicated ICDs.

And while this is not harmful in most cases, with Red Dead Redemption 2 this causes a crash at startup https://github.com/ValveSoftware/steam-runtime/issues/336