(svn r14191) -Codechange: unify the code to skip sprite payload (i.e. not the header).

-Fix: sprite payload skipping wouldn't skip enough bytes in a very small subset of compressed sprites.

src/sprite.h

@@ -56,5 +56,6 @@ struct DrawBuildingsTileStruct {
 /** Iterate through all DrawTileSeqStructs in DrawTileSprites. */
 #define foreach_draw_tile_seq(idx, list) for (idx = list; ((byte) idx->delta_x) != 0x80; idx++)
 
+void SkipSpriteData(byte type, uint16 num);
 
 #endif /* SPRITE_H */