winhttp: Store credentials set with WinHttpSetCredentials separately from username and password set through options.

[Hans Leidekker]

---
 dlls/winhttp/request.c         | 55 ++++++++++++++++++++-----------
 dlls/winhttp/session.c         | 10 +++++-
 dlls/winhttp/tests/winhttp.c   | 75 ++++++++++++++++++++++++++++++++++++++++--
 dlls/winhttp/winhttp_private.h | 16 ++++++++-
 4 files changed, 133 insertions(+), 23 deletions(-)

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