wininet: Return size when buffer too small

[Rotem Zach]

When InternetQueryOption is called with an insufficient buffer length,
it returns the needed buffer size.
This patch implements that, and it includes a conformance test for the
changes.


Fixed the very long lines, sorry about that.


---
 dlls/wininet/http.c           |   35 ++++++---
 dlls/wininet/internet.c       |   47 +++++++++---
 dlls/wininet/tests/internet.c |  166
+++++++++++++++++++++++++++++++++++++++++
 3 files changed, 226 insertions(+), 22 deletions(-)

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