wininet: Always make copies of strings passed to INTERNET_SendCallback.

[Robert Shearman]

This ensures that applications that change the strings received in 
status callbacks don't affect the data needed to successfully connect to 
the correct server.
---
  dlls/wininet/tests/http.c |    5 +++++
  dlls/wininet/utility.c    |   12 ++++++++++++
  2 files changed, 17 insertions(+), 0 deletions(-)
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