wininet: Allow HTTP_DoAuthorization to accept a NULL username/domain in the non-Basic case.

[Robert Shearman]

When using SSPI, pass in a NULL identity in this case so that the SSP 
can try to use cached credentials.
---
  dlls/wininet/http.c |   56 
++++++++++++++++++++++++++++++++------------------
  1 files changed, 36 insertions(+), 20 deletions(-)
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