fix loss of data warnings with vc15 win64 and /W4
fix loss of data warnings with vc15 win64 and /W4

Signed-off-by: David Loffredo <db664da926ba28b60bc091f13bc0bb16d1674c0e@steptools.com>

libexpat/libexpat,libexpat/libexpat,libexpat/libexpat,libexpat/libexpat,libexpat/libexpat,libexpat/libexpat