zink: Added inbuilt debug logging from the VK_LAYER_LUNARG_standard_validation layer.

Set the ZINK_DEBUG environment variable to 'validation' to automatically setup.
The debug util extnsion callback is used to capture information and logs the results to the error stream.

Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7431>
2 files changed