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>

tests/functional/test_aarch64_virt_gpu.py

@@ -91,6 +91,9 @@ class Aarch64VirtGPUMachine(LinuxKernelTest):
 
     @skipIfMissingCommands('zstd')
     def test_aarch64_virt_with_vulkan_gpu(self):
+
+        self.require_device('virtio-gpu-gl-pci')
+
         self._launch_virt_gpu("virtio-gpu-gl-pci,hostmem=4G,blob=on,venus=on")
         self._run_virt_weston_test("vkmark -b:duration=1.0")