ext/xmlrpc using libxml2 View as Markdown

I was playing around with the compile of xmlrpc using libxml2
 and got it to somewhat work (more about that later :).

 I took the shortcut of using the compatibility layer which is
 used by ext/xml (compat.c and expat_compat.h).

 Now, before I commit this stuff I'd like to know if this is
 even wanted result? Or should the whole thing be converted
 to really use libxml2 without any layers between?

 About the "somewhat work" part: It works as long as there aren't
 any errors with the XML. :) When there are, the thing just hangs.
 Backtrace showed it hangs somewhere inside xmlParseChunk()..

 --Jani