If the Kerberos v5 principal name is
WELLKNOWN/ANONYMOUS@WELLKNOWN:ANONYMOUS
and the principal type is KRB5_NT_WELLKNOWN, then gss_display_name()
is expected to return GSS_C_NT_ANONYMOUS instead of
GSS_KRB5_NT_PRINCIPAL_NAME. This change matches the behavior of
MIT Kerberos.