Otherwise, the call will now fail with SEC_E_INVALID_HANDLE.

secur32: Fix NTLM's InitializeSecurityContextA/W to be flexible with the index of the token buffer in both the input and output buffer descriptions.

secur32: Make the NTLM SSP cope with a NULL phCredential parameter when InitializeSecurityContext is called more than once.

secur32: Fix the wrapper InitializeSecurityContextA/W functions to handle phContext and phNewContext parameters being optional for some SSPs.