pam_exec patch and mount_smbfs

[Zane C.B.]

Figured some one may find this interesting. The patch modifies
pam_exec to export PAM_AUTHTOK as a environmental variable.

I am currently working on modifying mount_smbfs to be able to use a
specified environmental variable password instead of asking for one.

The purpose of this is to be able to use pam_exec to be able to mount
a user's home directory from samba.
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