d3d8/tests: Skip tests if we can't create the D3D8 object.

[Huw Davies]

---
 dlls/d3d8/tests/device.c  |    9 +++++++++
 dlls/d3d8/tests/surface.c |    7 +++++--
 dlls/d3d8/tests/texture.c |    7 +++++--
 dlls/d3d8/tests/visual.c  |    7 +++++--
 dlls/d3d8/tests/volume.c  |    7 +++++--
 5 files changed, 29 insertions(+), 8 deletions(-)
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