vulkan/wsi/x11: add support to detect if we can support rendering (v3)

vulkan/wsi/x11: add support to detect if we can support rendering (v3)

This adds support to radv_GetPhysicalDeviceXlibPresentationSupportKHR
and radv_GetPhysicalDeviceXcbPresentationSupportKHR to check if the
local device file descriptor is compatible with the descriptor
retrieved from the X server via DRI3.

This will stop radv binding to an X server until we have prime
support in place. Hopefully apps use this API before trying
to render things.

v2: drop unneeded function, don't leak memory. (jekstrand)
v3: also check in surface_get_support callback.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>