anv/wsi: signal the semaphore in the acquireNextImage

We seem to have forgotten about the semaphore in the
acquireNextImageInfo.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: <mesa-stable@lists.freedesktop.org>
25 jobs for !357 with wip/djdeath/fix-acquire-next-image-semaphore-signal in 58 minutes and 18 seconds (queued for 2 minutes and 7 seconds)
latest detached
Status Job ID Name Coverage
  Containers Build
passed #145891
containers:ubuntu

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  Build+Test
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build:make-gallium-drivers-other

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build:make-gallium-drivers-radeonsi

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build:make-gallium-drivers-swr

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build:make-gallium-st-clover-llvm-39

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build:make-gallium-st-clover-llvm-4

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build:make-gallium-st-clover-llvm-5

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build:make-gallium-st-clover-llvm-6

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build:make-gallium-st-clover-llvm-7

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build:make-gallium-st-other

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passed #145903
build:make-loader-classic-dri

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passed #145902
build:make-vulkan

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passed #145898
build:meson-gallium-clover-llvm5

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build:meson-gallium-clover-llvm6

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build:meson-gallium-clover-llvm7

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passed #145897
build:meson-gallium-drivers-other

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passed #145896
build:meson-gallium-radeonsi

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build:meson-gallium-st-other

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build:meson-gallium-swr

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build:meson-glvnd

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build:meson-loader-classic-dri

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build:meson-vulkan

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build:scons-llvm

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build:scons-nollvm

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passed #145915
build:scons-swr

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