[xml] IN_LIBXML define

["Richard Jinks" <cyberthymia yahoo co uk>]

Probably more of a thing for Igor, but compiling libxml 2.4.13 in VC++ 6
issues warnings that IN_LIBXML is multiply defined.

This is because IN_LIBXML is now defined in libxml.h (new to this version),
but is still defined in the project settings that determine the parameters
for the compiler.
To get round this you could either put a #ifndef IN_LIBXML ... #endif guard
around the define, or remove the definition from the libxml2 project
setting.

I suspect Igor might have a nicer solution when he gets the new version.

Thanks,
Richard


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