msxml3: protect DOMElement implementation with HAVE_LIBXML2

[Michael Jung]

This fixes msxml3 compilation on debian sarge, if libxml2-dev headers are not 
installed. I've imitated Mike's scheme from domdoc.c.

Changelog:
	Protect DOMElement implementation with HAVE_LIBXML2

-- 
Michael Jung
mjung at iss.tu-darmstadt.de
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