Fixed compile errors when XML_DTD and XML_CONTEXT_BYTES were undefined.
Fixed compile errors when XML_DTD and XML_CONTEXT_BYTES
were undefined.

tiran/expat,libexpat/libexpat,tiran/expat,libexpat/libexpat,tiran/expat,libexpat/libexpat,tiran/expat,libexpat/libexpat,libexpat/libexpat,libexpat/libexpat