wined3d: Add GL_NV_point_sprite extension. (try 2)(resend)

[Rico Schüller]

---
  dlls/wined3d/context.c    |   34 +++++++++++++++++++++++++++++-----
  dlls/wined3d/directx.c    |    1 +
  dlls/wined3d/drawprim.c   |    4 +++-
  dlls/wined3d/wined3d_gl.h |   16 ++++++++++++++++
  4 files changed, 49 insertions(+), 6 deletions(-)


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