Fixed typos and made all assert functions optional

src/core/CdStream.cpp

@@ -23,9 +23,7 @@ struct CdReadInfo
 	OVERLAPPED Overlapped;
 };
 
-#ifdef CHECK_STRUCT_SIZES
 VALIDATE_SIZE(CdReadInfo, 0x30);
-#endif
 
 char gCdImageNames[MAX_CDIMAGES+1][64];
 int32 gNumImages;