winhttp: Add support for retrieving the URL codepage.

[Hans Leidekker]

---
 dlls/winhttp/request.c       | 21 +++++++++++++++++++--
 dlls/winhttp/tests/winhttp.c | 36 +++++++++++++++++++++++++++++++++++-
 2 files changed, 54 insertions(+), 3 deletions(-)

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