advpack: Handle dwFlags for DelNode with tests

[James Hawkins]

Hi,

I changed the invalid CharPrev != "\\" comparison to string[len] != '\\'.

Changelog
* Use DelNode itself for the directory recursion.
* Handle the dwFlags parameter.
* Factor out file creation and deletion.
* Add test cases for DelNode and make them pass.

 dlls/advpack/advpack.c       |  161 ++++++++++++++++++++++++------------------
 dlls/advpack/tests/advpack.c |  153 ++++++++++++++++++++++++++++++++++------
 2 files changed, 225 insertions(+), 89 deletions(-)

--
James Hawkins
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