msxml3: Fix varargs handling in libxml2 error callback implementation

[Nikolay Sivov]

The problem is that vsnprintf() was called multiple times with same 
va_list. Ti fix that it was necessary to get rid of some tracing bits 
like macro-defined callback calls and a single function for all kinds of 
error types.

As far as I understand this problem it leads to a stack corruption when 
va_list is used multiple time without va_start/va_end around it, so it's 
critical to fix.
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