Fix test_nsalloc_realloc_long_context_in_dtd() to work in UTF-16
Fix test_nsalloc_realloc_long_context_in_dtd() to work in UTF-16

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