Fix compiles for systems with libxml2 version 2.6.14 and below

[Lei Zhang]

Systems with libxml2 version 2.6.14 and below cannot compile wine
because older versions of libxml2 does not have xmlNewDocPI().

Changelog:
* Added check for xmlNewDocPI() in libxml2.
* Disable domdoc_createProcessingInstruction() if the system does not
have xmlNewDocPI().
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