wined3d: Add GL_NV_point_sprite extension.

[Rico Schüller]

Hi,

this patch adds the GL_NV_point_sprite extension. It is used in cases 
where the function pointer for glPointParameteri couldn't be queried. 
This is the case on windows, which only supports opengl 1.1 so the 
function pointers to 2.0 functions aren't available. So we need to use 
the extension.

Cheers
Rico


---
  dlls/wined3d/context.c    |   34 +++++++++++++++++++++++++++++-----
  dlls/wined3d/directx.c    |    1 +
  dlls/wined3d/drawprim.c   |    5 ++++-
  dlls/wined3d/wined3d_gl.h |   16 ++++++++++++++++
  4 files changed, 50 insertions(+), 6 deletions(-)


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