d3dx8_math interface and stubs

["Rok Mandeljc" <rokmandeljc@hotmail.com>]

I've implemented part of d3dx8.dll related to d3dx8math.h header (stubs,
I'll implement real functs later).
This is my first work with COM interfaces so please someone check it if it's
ok.

ChangeLog:
 - added files:
     - wine/dlls/d3dx8/d3dx8math.c (direct3d x 8 math functions)
       - wine/dlls/d3dx8/d3dx8math_private.h (ID3DXMatrixStack
Implementation)
        -  wine/dlls/d3dx8/d3dxmatrixstack.c (ID3DXMatrixStack stubs)
        - wine/include/d3dx8math.h  (Direct3D X 8 Math definitions and
ID3DXMatrixStack Interface)
        - wine/include/d3dx8math.inl  (inline Direct3D X 8 Math functions)
- some minor adjustments in existing files

Attachment: d3dx8_math.patch
Description: Binary data