[krbdev.mit.edu #8566] krb5_init_context() should detect set-uid-ness
I am a bit concerned that using the broken issetugid() on FreeBSD (and
NetBSD, if it's also broken there) could break legitimate uses of
Kerberos environment variables with httpd. Of course we can address
that, at least partially, by limiting our use of issetugid() to
platforms where it is known not to be broken.
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