vulkan/wsi/display: don't report support if there is no drm fd

This partially deals with
#4688

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: mesa-stable
Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <!10430>
67 jobs for !10430 with review/vulkan-wsi-display-support in 21 minutes and 12 seconds (queued for 3 seconds)
latest detached
Status Job ID Name Coverage
  Sanity
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sanity

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  Container
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aarch64
arm_build

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windows shell 1809 mesa
windows_build_vs2019

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x86_build-base

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x86_test-base

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  Container 2
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android_build

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i386_build

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kernel+rootfs_amd64

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aarch64
kernel+rootfs_arm64

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aarch64
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ppc64el_build

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s390x_build

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x86_build

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x86_test-gl

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x86_test-vk

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  Meson X86 64
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meson-clang

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meson-clover

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meson-clover-testing

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meson-gallium

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meson-release

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meson-testing

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meson-testing-asan

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meson-vulkan

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  Build Misc
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arm_test

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meson-android

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aarch64
meson-arm64

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aarch64
meson-arm64-asan

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aarch64
meson-arm64-build-test

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aarch64
meson-armhf

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meson-i386

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meson-mingw32-x86_64

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meson-ppc64el

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kvm
meson-s390x

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windows docker 1809 mesa
meson-windows-vs2019

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  Amd
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radv-fossils

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  Broadcom
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igalia-rpi4
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igalia-rpi4
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igalia-rpi4
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igalia-rpi4
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igalia-rpi4
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  Freedreno
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google-freedreno-db410c
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google-freedreno-db410c
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google-freedreno-db410c
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google-freedreno-db410c
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google-freedreno-db410c
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google-freedreno-db410c
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google-freedreno-db820c
a530_gles2

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google-freedreno-db820c
a530_gles31 1/2

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google-freedreno-db820c
a530_gles3 1/2

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google-freedreno-db820c
a530_gles31 2/2

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google-freedreno-db820c
a530_gles3 2/2

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google-freedreno-db820c
a530_piglit_gl

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google-freedreno-db820c
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google-freedreno-db820c
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google-freedreno-cheza
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google-freedreno-cheza
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google-freedreno-cheza
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google-freedreno-cheza
a630_gles3

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google-freedreno-cheza
a630_gles31

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google-freedreno-cheza
a630_gles_others

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google-freedreno-cheza
a630_piglit

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google-freedreno-cheza
a630-traces

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google-freedreno-cheza
a630_vk 1/2

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google-freedreno-cheza
a630_vk 2/2

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google-freedreno-cheza
a630_vk_sysmem

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  Layered Backends
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windows docker 1809 mesa
test-d3d12-windows

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