vulkan/wsi: Close file descriptors in wsi_destroy_image

vulkan/wsi: Close file descriptors in wsi_destroy_image

Most of the time, this is a non-issue because the WSI back-end closes
them as part of handing them to the window-system and sets fds[*] to -1.
The one exception here was Wayland which was closing them but leaving
fds[*] pointing to bogus file descriptors.  Having wsi_destroy_image
close them makes clean-up easier and more reliable.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Simon Ser <contact@emersion.fr>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16333>