If someone were to remove the libraries that are needed for these,
`default` would simply not enable these tests, and the only thing we
could notice is that test jobs would suddenly take less time to run.
Instead, let's have a check to make sure dEQP's cmake has detected
everything and enabled these platforms.
Reviewed-by: David Heidelberg <david.heidelberg@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27041>
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