libxml2 use in Wine?

[Gerald Pfeifer]

A user reported that when he has libxml2 installed when building
Wine, "some apps" work fine whereas without libxml2 he get's warning
and errors and reduce functionality.

And indeed the configure code and some other part of Wine do refer to
libxml2.

However, there is now documentation (as verified via `grep -ri libxml2`)
that mentions libxml2 in any way.

Is there any specific reason, or is this just an omission, and a patch
to wine/README would be welcome?

Gerald