wintrust: Implement WTHelperGetProvPrivateDataFromChain.

[Robert Shearman]

Also fill in pfnAddPrivData2Chain in WintrustLoadFunctionPointers, which 
is the complement of WTHelperGetProvPrivateDataFromChain.
---
  dlls/wintrust/register.c      |    2 +-
  dlls/wintrust/wintrust.spec   |    2 +-
  dlls/wintrust/wintrust_main.c |   57 
+++++++++++++++++++++++++++++++++++++++++
  dlls/wintrust/wintrust_priv.h |    2 +
  include/wintrust.h            |    1 +
  5 files changed, 62 insertions(+), 2 deletions(-)

This is used by native cryptdlg.dll.
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