add missing file from sweng/"forward declare" commit
This was SVN commit r4254.
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source/lib/sdl_fwd.h
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15
source/lib/sdl_fwd.h
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#ifndef SDL_FWD_H__
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#define SDL_FWD_H__
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// 2006-08-26 SDL is dragged into 6 of our 7 static library components.
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// it must be specified in each of their "extern_libs" so that the
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// include path is set and <SDL/sdl.h> can be found.
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//
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// obviously this is bad, so we work around the root cause. mostly only
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// SDL_Event is needed. unfortunately it cannot be forward-declared,
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// because it is a union (regrettable design mistake).
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// we fix this by wrapping it in a struct, which can safely be
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// forward-declared and used for pointers.
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struct SDL_Event_;
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#endif // #ifndef SDL_FWD_H__
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