d3d8: Add lock/unlock test.

[Rico Schüller]

---
  dlls/d3d8/tests/Makefile.in |    1 +
  dlls/d3d8/tests/buffer.c    |  137 
+++++++++++++++++++++++++++++++++++++++++++
  2 files changed, 138 insertions(+), 0 deletions(-)
  create mode 100644 dlls/d3d8/tests/buffer.c


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