Add InitializeSecurityContext for schannel

[Vijay Kiran Kamuju]

When checking why does the googletalk fail for wine,
I found out that we dont have InitializeSecutiryContext for schannel
This is just the same thing we have for negotiate.
This might give impetus for me or someone to work on this.
It doesnot do anything now.

ChangeLog
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Add InitializeSecurityContext for schannel in secur32.dll
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