tests/functional: ensure we have a GPU device for tests

It's possible to build QEMU without support for the GL enabled GPU
devices and we can catch that earlier with an explicit check.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20250304222439.2035603-4-alex.bennee@linaro.org>
1 file changed