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Subject: SPNEGO doesn't implement gss_inquire_cred_by_mech
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SPNEGO has no entry point for gss_inquire_cred_by_mech, so we produce a 
GSS_S_BAD_BINDINGS error if an application tries to inquire a cred by that 
mechanism.

The implementation should be straightforward, albeit annoying similar to 
the inquire_cred code.