GHETTO STOPGAP HACK
Since there's no good way to get the Summer 2004 DirectX SDK working with conflicting dxerr/dxerr9 and DXGetErrorString/DXGetErrorString9, this is the biggest possible hack I can think of.

instruction list for future reference:
1) Try building first. If you get errors, proceed to step 2.
2) Uncomment the following sections (and comment the alternate line):
 * the section with the dxerr9.h dxerr9.lib below.
 * the section with DXGetErrorString9 below.
 * the section with dxerr9.h in RageDisplay_D3D.cpp.
 * the section with dxerr9.lib in RageDisplay_D3D.cpp.
 * GetErrorString in RageDisplay_D3D.cpp.
3) DON'T COMMIT CHANGES TO THIS FILE <- the hard part