ddraw: Make tests pass when OpenGL libraries aren't present.

[Mike McCormack]

---
  dlls/ddraw/main.c             |    4 +++-
  dlls/ddraw/tests/ddrawmodes.c |   12 +++++++++---
  dlls/ddraw/tests/dsurface.c   |   13 ++++++++++---
  dlls/ddraw/tests/refcount.c   |    2 +-
  4 files changed, 23 insertions(+), 8 deletions(-)
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