pam-krb5: Import/add pam-krb5 from eyeire.org

From https://www.eyrie.org/~eagle/software/pam-krb5/:

pam-krb5 provides a Kerberos PAM module that supports authentication,
user ticket cache handling,

pam-krb5: Import/add pam-krb5 from eyeire.org

From https://www.eyrie.org/~eagle/software/pam-krb5/:

pam-krb5 provides a Kerberos PAM module that supports authentication,
user ticket cache handling, simple authorization (via .k5login or
checking Kerberos principals against local usernames), and password
changing. It can be configured through either options in the PAM
configuration itself or through entries in the system krb5.conf file,
and it tries to work around PAM implementation flaws in commonly-used
PAM-enabled applications such as OpenSSH and xdm. It supports both
PKINIT and FAST to the extent that the underlying Kerberos libraries
support these features.

The reason for this import is to provide an MIT KRB5 compatible
pam_krb5 PAM module. The existing pam_krb5 in FreeBS only works
with Heimdal.

The Makefiles to hook this software into the build willl come later.

Sponsored by: The FreeBSD Foundation

Add 'contrib/pam-krb5/' from commit '24f0b4ca2d565cdbb4fe7839ff28320706bf2386'

git-subtree-dir: contrib/pam-krb5
git-subtree-mainline: 290e8aaa384085a7f691b2a140b5a904794eb83c
git-subtree-split: 24f0b4ca2d565cdbb4fe7839ff28320706bf2386

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