secur32: Remove hardcoded assumption that the SECBUFFER_DATA is always at index 1 for en/decrypting.

[Kai Blin]

Thanks to Rob Shearman for poking me repeatedly.
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 dlls/secur32/ntlm.c |   45 +++++++++++++++++++++++++++++++++++++--------
 1 files changed, 37 insertions(+), 8 deletions(-)
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