(svn r2522) Reorganize sprite load and decompression in order to remove a special case from the sprite blitter, which decompressed certain sprites every time when blitting them

spritecache.h

@@ -9,7 +9,6 @@ typedef struct Sprite {
 	int16 y_offs;
 	byte data[VARARRAY_SIZE];
 } Sprite;
-assert_compile(sizeof(Sprite) == 8);
 
 typedef struct {
 	int xoffs, yoffs;