wininet: Return buffer size when buffer too small

[Rotem Zach]

When InternetQueryOption is called with an insufficient buffer legnth,
it returns the needed buffer size.

This patch implements that for several cases, and it includes a
conformance test for the changes.

---
 dlls/wininet/internet.c       |   12 ++++++++++++
 dlls/wininet/tests/internet.c |   38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+), 0 deletions(-)

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