Make visible implementations of with the same functionality of "loadfile,dofile,writeclosuretofile" but working on strings "dostring,loadstring,dumpclosure"

sqstdlib/sqstdio.cpp

@@ -458,6 +458,9 @@ static SQRegFunction iolib_funcs[]={
 	_DECL_GLOBALIO_FUNC(loadfile,-2,_SC(".sb")),
 	_DECL_GLOBALIO_FUNC(dofile,-2,_SC(".sb")),
 	_DECL_GLOBALIO_FUNC(writeclosuretofile,3,_SC(".sc")),
+	_DECL_GLOBALIO_FUNC(dostring,-2,_SC(".sb")),
+	_DECL_GLOBALIO_FUNC(loadstring,-2,_SC(".sb")),
+	_DECL_GLOBALIO_FUNC(dumpclosure,3,_SC(".sc")),
 	{0,0}
 };