winhttp: Use netconn_query_data_available in get_available_data when possible.

[Jacek Caban]

---
 dlls/winhttp/net.c             | 27 +++++++++++++--------------
 dlls/winhttp/request.c         |  2 +-
 dlls/winhttp/winhttp_private.h |  2 +-
 3 files changed, 15 insertions(+), 16 deletions(-)


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