wininet: Add support for SSPI authentication for HTTP.

[Robert Shearman]

---
  dlls/wininet/Makefile.in |    2 +-
  dlls/wininet/http.c      |  306 
+++++++++++++++++++++++++++++++++++++++++++++-
  dlls/wininet/internet.h  |    4 +
  3 files changed, 309 insertions(+), 3 deletions(-)
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