Add configure arguments for LibXml2 v2.9.10.
Add configure arguments for LibXml2 v2.9.10.

cellml/libcellml,nickerso/libcellml,hsorby/libcellml,cellml/libcellml,cellml/libcellml,nickerso/libcellml,hsorby/libcellml,nickerso/libcellml,nickerso/libcellml,cellml/libcellml,hsorby/libcellml,hsorby/libcellml