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Subject: rework gic_opt_ext to be more portable
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krb5_gic_opt_ext is an opaque structure that is supposed to be
binary-compatible with krb5_get_init_creds_opt, but might not conform to
the C standard due to type punning.  Fix this by including a copy of
krb5_get_init_creds_opt as the first member of krb5_gic_opt and doing
all dependent changes.