[08/12] msxml3: Add an internal IUnknown object for xmlnode

[Michael Karcher]

This makes the xmlnode structures kind-of aggregatable COM objects.
The explanation of the new reference management is in the rather verbose
comment at the top of the new node_unk.c file.
---
 dlls/msxml3/Makefile.in     |    1 +
 dlls/msxml3/msxml_private.h |    6 +
 dlls/msxml3/node_unk.c      |  283 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 290 insertions(+), 0 deletions(-)
 create mode 100644 dlls/msxml3/node_unk.c
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