libxml-2.0:  fix Html.Doc.new_no_dtd cname
libxml-2.0:  fix Html.Doc.new_no_dtd cname

Fixes bug 689368.

spidermonkdust/vala,frida/vala,severinh/vala,GNOME/vala,Distrotech/vala,Distrotech/vala,frida/vala,playya/vala,frida/vala,flobrosch/vala-fixes,rvu95/vala,Distrotech/vala,severinh/vala,GNOME/vala,playya/vala,frida/vala,flobrosch/vala-fixes,spidermonkdust/vala,rvu95/vala,xdave/pvala,rvu95/vala,GNOME/vala,GNOME/vala,playya/vala,spidermonkdust/vala,severinh/vala,flobrosch/vala-fixes,frida/vala