d3dx9_36: Allow NULL pointer for optional arguments of D3DXIntersectTri.

[Sebastian Lackner]

Fixes bug 35133.

---
 dlls/d3dx9_36/mesh.c       | 6 +++---
 dlls/d3dx9_36/tests/mesh.c | 9 +++++++++
 2 files changed, 12 insertions(+), 3 deletions(-)
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