Extends the flexability of the device info script.
Allows #if defined()/#endif guards around particular data, for platform or version specific structures.
Allows for feature structures to be retreved without having to have a have_ variable as well. Helps if there is more than one feature in the structure.
These changes help towards allowing the use of the portability set extensions.
Reviewed-by: Hoe Hao Cheng <haochengho12907@gmail.com>
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/7457>
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