mshtml/tests: Fix htmldoc test on Windows Server and Win7

[Ge van Geldorp]

The htmldoc test hung on Windows Server editions when IE Enhanced Security
Configuration was enabled.
Also made the tests pass on Win7. There were some IID_unkx values defined for
which Visual Studio displayed names. These names don't appear in SDK header
files so I defined them locally.

Changelog:
  mshtml/tests: Fix htmldoc test on Windows Server and Win7

---
 dlls/mshtml/tests/dom.c         |   22 +---------------------
 dlls/mshtml/tests/htmldoc.c     |   28 +++++++++++++++++++++++-----
dlls/mshtml/tests/mshtml_test.h |   36
++++++++++++++++++++++++++++++++++++
 dlls/mshtml/tests/script.c      |   22 +---------------------
 dlls/urlmon/tests/sec_mgr.c     |    2 +-
 5 files changed, 62 insertions(+), 48 deletions(-)
 create mode 100644 dlls/mshtml/tests/mshtml_test.h



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