DOOM (2016) asks for exactly two swapchain images and stops with "FATAL
ERROR: getSwapchainImagesKHR failed with error (VK_SUCCESS)" when it gets
more. Every game launch gets GAMESCOPE_WSI_MIN_IMAGE_COUNT=8 and
GAMESCOPE_WSI_ENSURE_MIN_IMAGE_COUNT=1, so gamescope's WSI layer gave it 8
images (3 with only the count removed) and the game crashed on start.
When DOOMx64vk.exe sits beside the launched program (DOOMx64.exe for a GOG
install, or DOOMx64vk.exe), both variables are removed and
vk_x11_strict_image_count=true is set, the option Mesa's driconf gives the
game. Other games keep the defaults. A per-game value in the environment
editor still wins.
Tested on an AYANEO Pocket FIT with DroidDeck 0.6.9 and the same values set
per game: the swapchain gets 2 images and the game reaches its main menu at
60 fps; before, it crashed on every launch.
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