krb5: Import MIT 1.21.3

Import MIT KRB5 1.21.3, which will gracefully replace KTH Heimdal.

The tarball used in this import is the same tarball used in
ports/krb5-121.

The Makefiles to add MIT KRB5

krb5: Import MIT 1.21.3

Import MIT KRB5 1.21.3, which will gracefully replace KTH Heimdal.

The tarball used in this import is the same tarball used in
ports/krb5-121.

The Makefiles to add MIT KRB5 to the build will be added later.

Obtained from: http://web.mit.edu/kerberos/dist/

Sponsored by: The FreeBSD Foundation

Add 'crypto/krb5/' from commit '8f7d3ef26dec89a92ec0665de84a5936310a5574'

git-subtree-dir: crypto/krb5
git-subtree-mainline: bf6873c5786e333d679a7838d28812febf479a8a
git-subtree-split: 8f7d3ef26dec89a92ec0665de84a5936310a5574

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