vulkan/wsi: check if the display_fd given is master

vulkan/wsi: check if the display_fd given is master

As effectively required by the extension, we need to ensure we're master

Currently drivers employ vendor specific solutions, which check if the
device behind the fd is capable*, yet none of them do the master check.

*In the radv case, if acceleration is available.

Instead of duplicating the check in each driver, keep it where it's
needed and used.

Note this copies libdrm's drmIsMaster() to avoid depending on bleeding
edge version of the library.

v2: set the fd to -1 if not master (Bas)

Fixes: da997ebec92 ("vulkan: Add KHR_display extension using DRM [v10]")
Cc: Andres Rodriguez <andresx7@gmail.com>
Cc: Jason Ekstrand <jason@jlekstrand.net>
Cc: Keith Packard <keithp@keithp.com>
Reported-by: Andres Rodriguez <andresx7@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>